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ILLUSTRATIONS.

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PLATE I. Map of United States, showing areas covered by topographic surveys.
II. Map of Alabama, Mississippi, Arkansas, and Louisiana, showing

progress of topographic surveying and primary control ......
III. Map of Florida, showing progress of topographic surveying and pri-

mary control....
IV. Map of Indiana, Illinois, Iowa, and Missouri, showing progress of

topographic surveying and primary control...
V. Map of Kentucky and Tennessee, showing progress of topographic

surveying and primary control.....
VI. Map of Minnesota, showing progress of topographie surveying and

primary control....
VII. Map of Nebraska and Kansas, showing progress of topographic sur-

veying and primary control.... VIII. Map of Maine, New Hampshire, Vermont, Massachusetts, Rhode

Island, Connecticut, and New York, showing progress of topo

graphic surveying and primary control ..
IX. Map of Pennsylvania, New Jersey, Delaware, Maryland, Virginia,

West Virginia, and Ohio, showing progress of topographic survey

ing and primary control
X. Map of North Carolina, South Carolina, and Georgia, showing prog-

ress of topographic surveying and primary control......
XI. Map of Michigan and Wisconsin, showing progress of topographic

surveying and primary control.....
XII. Map of North Dakota and South Dakota, showing progress of topo-

graphic surveying and primary control XIII. Map of Arizona and New Mexico, showing progress of topographic

surveying and primary control..... XIV. Map of northern California, showing progress of topographic sur

veying and primary control..... XV. Map of southern California, showing progress of topographic survey

ing and primary control..... XVI. Map of Colorado, showing progress of topographic surveying and

primary control.. XVII. Map of Idaho, showing progress of topographic surveying and pri

mary control... XVIII. Map of Indian Territory, Oklahoma, and northern Texas, showing

progress of topographic surveying and primary control XIX. Map of Montana, showing progress of topographic surveying and

primary control. XX. Map of southern Texas, showing progress of topographic surveying

and primary control.

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PLATE XXI. Map of Nevada and Utah, showing progress of topographic sur

veying and primary control ......
XXII. Map of Washington and Oregon, showing progress of topo-

graphic surveying and primary control...
XXIII. Map of Wyoming, showing progress of topographic surveying

and primary control XXIV. Map of United tes, showing location of principal river sta

tions maintained during 1903-4...

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