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been definitely outlined and new ones discovered; and finally, improvement in methods and special training in the calculation of oil reserves and of the depletion of oil properties have been developed to meet the requirements of the tax laws. Accordingly, in order that the public may get the fullest benefit of this newly available information, the United States Geological Survey in March, 1921, invited the American Association of Petroleum Geologists to cooperate with it in a review of the producing, probable, and possible oil territory of the United States and in the compilation of an estimate of the petroleum remaining in the ground and recoverable by present methods. This invitation was promptly accepted by the association, which designated a number of its ablest members of well-known wide experience, good judgment, and high professional standing to serve with the oil geologists of the survey as members of a joint committee. The committee responsible for the original preparation of the estimates and finally for the adjustment and revision of the results in joint conference comprised F. W. DeWolf, State geologist of Illinois; W. E. Wrather, of Dallas, Tex.; Roswell H. Johnson, of Pittsburgh, Pa.; Wallace A. Pratt, of Houston, Tex.; Alexander W. McCoy, of Bartlesville, Okla.; Carl H. Beal, of San Francisco, Calif.; C. T. Lupton, of Denver, Colo.; Alexander Deussen, of Houston, Tex.; K. C. Heald, of Washington, D. C; and G. C. Matson, of Tulsa, Okla., all representing the American Association of Petroleum Geologists; and, for the Federal Survey, David White, chief geologist, chairman; W. T. Thorn, jr., A. E. Fath, Kirtly F. Mather, P. C. Moore, State geologist of Kansas, and K. C. Heald. Mr. Heald represented both the survey and the association. These men were assisted in subcommittees by a large number of the leading oil geologists of the country, including oil-company geologists, directors of State geological surveys, and consulting geologists, who were especially familiar with the regions considered. All these cooperated whole-heartedly in the canvas of our oil reserves, and many oil companies also furnished confidential data for use in the preparation of estimates. The calculations of the oil reserves in the proved and discovered fields are reasonably reliable, and those for regions regarded by the geologists as embracing "probable" future oil fields are based on all the available data and are entitled to high respect, but the committee wishes it most clearly understood that the estimates of oil in "possible" territory are absolutely speculative and hazardous and that, although they represent the best judgment of the geologists, they nevertheless may be, at least in part, wildly erroneous. The questions involved are not only how much a particular doubtful region will yield, but whether it will furnish any oil whatever. On the whole the estimates are undoubtedly the best that have ever been made for the United States and better than have hitherto been prepared for any oil country or district of the world. The estimates for local areas, fields, or districts have been consolidated by States, groups of States, or broad regions in the case of nonproductive States.Estimated oil reserves of the United States, by States or regions. Barrels. New York....100,000,000 Pennsylvania.....260,000,000 West Virginia.....200,000,000 Ohio.....190,000,000 Indiana and Michigan.....70,000,000 Illinois.....440,000,000 Kentucky, Tennessee, northern Alabama, and northeastern Mississippi.....175,000,000 Missouri, Iowa, North Dakota, Wisconsin, and Minnesota.....40,000,000 Kansas.....425,000,000 Oklahoma.....1,340,000,000 Northern Louisiana and Arkansas.....525,000,000 Texas, except Gulf coast.....670,000,000 Gulf coast, Texas, and Louisiana.....2,100,000,000 Colorado, New Mexico, and Arizona.....50,000,000 Wyoming.....525,000,000 Montana, Nebraska, and South Dakota.....100,000,000Utah, Nevada, Oregon, Washington, and Idaho.....80,000,000 California.....1,850,000,000 Eastern Gulf, Coastal Plain, and Atlantic Coast States.....10,000,000 Total.....9,150,000,000

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