United States total, 1956. 1,055 47, 264 4, 726 5,736,650 5, 438 2 11, 367 5, 684 5 31, 753 6, 351| 17 90, 384 5, 317 255 1, 191, 647 4, 673 272 1, 282, 031 713 110 1,042, 679 9, 479 259 1, 542, 749 5, 957 1, 424 8,322,078 5, 844 11, 150 50, 088, 586 4, 492 12, 574 58, 410, 664 4, 645 Ratio of wildcatting to all drilling and proportion of wildcats discovering new fields, by years, 1937-56 |