ery at the office of mailing subject to all of the following conditions:

(i) The address labels, which may not measure less than 3 by 44 inches, must show the full name and ZIP Code address of the sender and addressee and must be sorted by the mailer to the fourth and fifth digit of the ZIP Code.

(ii) Postage must be paid by permit imprints for each label, including labels returned as undeliverable. The imprint may be placed on the catalog or on the label. See § 145.1(a) of this chapter. The imprints must be prepared in the manner prescribed in subparagraph (1)(i) of this paragraph.

(iii) The mailer must submit with each mailing a statement on Form 3605 showing:

(a) The weight of a single piece.

(b) Total number of pieces in the mailing.

(c) Total number of pounds in the mailing.

(d) Total per piece charge.

(e) Total pound rate postage.

(f) Sum of postage at the per piece rate and at the pound rate.

(g) Name and address of mailer and permit number.

(iv) The total weight of pieces placed in sacks, cartons, crates or any other types of containers must not exceed 70 pounds.

(v) The address labels must be sent to the postmaster at the mailing (delivery) office by the mailer.

(vi) Address labels bearing incorrect, nonexistent or any other undeliverable addresses will be corrected or endorsed

to show why they are undeliverable and returned under cover to the mailer. Each envelope shall be rated with postage due at the rate of 10 cents for each address label contained in the envelope. At the request of the mailer, the postmaster will notify the mailer, at mailer's expense and by means specified by mailer, of the number of address labels being returned. The request for notification must accompany the labels. Correctly addressed labels will be held awaiting arrival of the catalogs.

(vii) Catalogs will be deposited at the acceptance point designated by the postmaster. If the number of catalogs deposited is not enough or too many to match the number of address labels, the postmaster will notify the sender, or his designated representative or agent, of the number of catalogs required to complete the delivery or the number in excess. If the additional catalogs are not delivered to the post office within 15 days, the excess address labels will be returned under cover to the mailer. As soon as deliveries are completed, the postmaster will notify the sender or his representative of the number of any excess catalogs on hand. Excess catalogs may be called for by the mailer without charge. Any excess catalogs not called for within 15 days will be returned to sender postage due at the single piece catalog rate.

(3) Single piece rates for individual mailings of catalogs (catalogs mailed at these rates must be marked catalogs) not mailed at bulk catalog rates in § 135.1 (b) (1) effective November 14, 1970:

Books; 16-millimeter or nar- 14 cents...... 7 cents.

rower width films and catalogs of such films (rate applies for films and catalogs except when mailed to or from commercial theaters); printed music, printed objective test materials, sound recordings, playscripts and manuscripts for books, periodicals and music; printed educational reference charts permanently processed for preservation; looseleaf pages, and binders therefor, consisting of medical information for distribution to doctors, hospitals, medical schools, and medical students. See §135.2 (a)(4).

and (d) may be mailed at the special rates shown in those sections, if desired.

(3) Catalogs and similar printed advertising matter in bound form, having 24 or more pages, at least 22 of which are printed, weighing 16 ounces or more but not exceeding 10 pounds, may be accepted at the zone rates in § 135.1 (b) (1) and (2).

(4) Only the following specifically described articles may be mailed at the special fourth-class rate provided by § 135.1 (c).

(i) Books, including books issued to supplement other books, of 24 pages or more, at least 22 of which are printed, consisting wholly of reading matter or scholarly bibliography or reading matter with incidental blank spaces for notations and containing no advertising matter other than incidental announcements of books. Advertising includes paid advertising and publishers' own advertising. Advertising may be in display, classified, or editorial style. The identification statement "Special Fourth-Class RateBooks" must be placed conspicuously on the address side of each package.

(ii) 16-millimeter films or narrower width films which must be positive prints in final form for viewing, and catalogs of such films of 24 pages or more, at least 22 of which are printed, except films and film catalogs sent to or from commercial theaters. The identification statement "Special Fourth-Class Rate-16 mm. or Narrower Films or 16 mm. or Narrower Film Catalog" must be placed conspicuously on the address side of each package.

(iii) Printed music whether in bound form or in sheet form. The identification statement "Special Fourth-Class RatePrinted Music" must be placed conspicuously on the address side of each package.

(iv) Printed objective test materials and accessories thereto used by or in behalf of educational institutions for testing ability, aptitude, achievement, interests, and other mental and personal qualities with or without answers, test scores, or identifying information recorded thereon in writing or by mark. The identification statement "Special Fourth-Class Rate-Objective Test Materials" must be placed conspicuously on the address side of each package.

(v) Sound recordings, including incidental announcements of recordings and

guides or scripts prepared solely for use with such recordings. Player piano rolls are classified as sound recordings. Miscellaneous advertisements, including trademarks, of persons or concerns other than the record manufacturer, are not permissible on title labels, protective sleeves, jackets, cartons, and wrappers, and such advertisements may not be mailed as enclosures. The identification statement "Special Fourth-Class RateSound Recordings" must be placed conspicuously on the address side of each package.

(vi) Playscripts and manuscripts for books, periodicals, and music. The identification statement "Special FourthClass Rate-Manuscript" must be placed conspicuously on the address side of each package.

(vii) Printed educational reference charts, permanently processed for preservation. The identification statement "Special Fourth-Class Rate-Educational Reference Charts" must be placed conspicuously on the address side of each package.

(viii) Looseleaf pages, and binders therefor, consisting of medical information for distribution to doctors, hospitals, medical schools, and medical students. The identification statement "Special Fourth-Class Rate-Medical Information" must be placed conspicuously on the address side of each package.

NOTE: When two or more articles described in this section are mailed in the same package, the appropriate descriptive terms shall be combined in the identification statement placed on the address side. Example: "Special Fourth-Class Rate-Books and Sound Recordings."

(5) Only the articles specifically described in paragraph (a) (5) of this section may be mailed at the fourth-class library rate provided by § 135.1(d). The identification statement "Library Rate" must be placed conspicuously on the address side of each package. Each package must show in the address or return address the name of a school, college, university, public library, or name of a nonprofit religious, educational, scientific, philanthropic, agricultural, labor, veterans, or fraternal organization or association. No permit is required.

(i) The following specific items when loaned or exchanged between schools,

colleges, or universities, and public libraries, museums, and herbaria, nonprofit religious, educational, scientific, philanthropic, agricultural, labor, veterans, or fraternal organizations or associations; or when cooperatively processed by libraries; or loaned or exchanged between libraries, organizations, or associations, and their members, readers, or borrowers, may be mailed at the library rate:

(a) Books, consisting wholly of reading matter, scholarly bibliography, or reading matter with incidental blank spaces for notations and containing no advertising other than incidental announcements of books.

(b) Printed music, whether in bound form or in sheet form.

(c) Bound volumes of academic theses in typewritten or duplicated form.

(d) Periodicals, whether bound or unbound.

(e) Sound recordings. (See also subparagraph (5) (ii) (b).)

(f) Other library materials in printed, duplicated, or photographic form or in the form of unpublished manuscripts.

(g) Museum materials, specimens, collections, teaching aids, printed matter, and interpretative materials intended to inform and to further the educational work and interests of museums and herbaria.

(ii) The following specific items when sent to or from schools, colleges, universities, public libraries, museums, and herbaria and to or from nonprofit religious, educational, scientific, philanthropic, agricultural, labor, veterans, or fraternal organizations or associations, may be mailed at the library rate:

(a) 16-millimeter or narrower width films; filmstrips; transparencies; slides; microfilms; all of which must be positive prints in final form for viewing.

(b) Sound recordings.

(c) Museum materials, specimens, collections, teaching aids, printed matter, and interpretative materials intended to inform and to further the educational work and interests of museums and herbaria.

(d) Scientific or mathematical kits, instruments, or other devices.

(e) Catalogs of the materials in paragraphs (5) (ii) (a), (b), (c), and (d) having 24 or more pages, at least 22 of

which are printed, and guides or scripts prepared solely for use with such materials.

(6) The address and each piece mailed at the rates provided by § 135.1 (c) and (d) must include the complete ZIP Code. When 5,000 or more identical pieces are mailed at these rates during a single day and there are enough pieces for the same destination to fill approximately onethird of a sack, they must be presorted and placed in sacks under the instructions contained in § 134.4 (c) of this chapter as follows: Subparagraph (2); and subdivisions (i)(b), (ii) (b),

(iii) (b),

(iv) (b), and (v) (b) of subparagraph (6). When 1,000 or more but less than 5,000 identical pieces are mailed at these rates during a single day and there are enough pieces for the same destination to fill approximately one-third of a sack, they must be presorted and placed in sacks under the instructions in § 134.4 (c) of this chapter as follows: Subparagraph (2); and subdivisions (ii) (b), (iii) (b), (iv) (d), and (v) (b) of subparagraph (6).

(b) Application of rates. (1) The rates in § 135.1 (a) and (b) are applied on the basis of weight of the individual piece and the zone between the sectional center facilities of the post offices of mailing and delivery. Articles addressed to military post offices overseas (Army, Air Force, Fleet post offices, and Naval vessels) require postage at the zone rate applicable between mailing office and post office shown in the address.

(2) There is a local zone which is defined by the Postmaster General from time to time and eight numbered zones which are determined as follows:

(i) The United States and its territories and possessions are divided into units of area 30 minutes square, identical with a quarter of the area formed by the intersecting parallels of latitude and meridians of longitude. Each unit of area is designated by a number.

(ii) The zones are based on a straight line distance between the unit of area in which the dispatching sectional center of the mailing post office is located and the unit of area in which the receiving sectional center facility of the post office of address is located, measured from the center of one unit to the nearest point in the other.

(iii) An official zone chart prepared for each sectional center will be used to determine zones from all postal units within the sectional center area. The

chart to be used is identified by the inclusive ZIP Codes assigned to postal units in the sectional center. Each chart lists the first three digits (prefix) of the Zip Codes of all sectional center offices and to the right thereof the applicable zone.

(iv) To determine the zone distance from the office of mailing to the office of address, refer to the zone chart for use at the office of mailing and locate on the chart the first three digits (prefix) of the ZIP Code of the post office of address. To the right thereof appears the

zone.

(v) An official zone chart may be obtained free by request to the postmaster at the office of mailing. For ZIP Code numbers, consult the National ZIP Code Directory.

(3) The rates in § 135.1 (c) and (d) are computed on the basis of the weight of the piece regardless of the zone to which addressed.

(4) The local rate in § 135.1 (a) and (b) applies to parcels mailed at any post office for local delivery at that office; at any city letter-carrier office or at any point within its delivery limits for delivery by carriers from that office; at any office from which a rural route starts for delivery on the same route; and on a rural route for delivery at the office from which the route starts or on any rural route starting from that office.

(5) The zone 1 rate in § 135.1 (a) and (b) applies to parcels mailed between two post offices in the same sectional center area.

(6) Gold coin, gold bullion, and gold dust, between any two points in Alaska, or between any point in Alaska and any point in the other States or U.S. possessions are charged the rate in § 135.1(a). The gold must be enclosed in sealed packages not exceeding 50 pounds in weight and sent by registered mail.

§ 135.3 Weight and size limits.

(a) Conditions for determining limits.

MEASURE GIRTH

MEASURE LENGTH