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Dolton, G.L., Carlson, K.H., Charpentier, R.R., Coury, A.B., Crovelli, R.A., Frezon, S.E., Khan, A.S., Lister, J.H., McMullin, R.H., Pike, R.S., Powers, R.B., Scott, E.W., and Varnes, K.L., 1981, Estimates of undiscovered recoverable conventional resources of oil and gas in the United States: U.S. Geological Survey Circular 860, 87 p. Energy Information Administration, 1994, U.S. Crude Oil, Natural Gas, and Natural Gas Liquids Reserves: Washington, D.C., 1993 Annual Report, 155 p. Gautier, D.L., Dolton, G.L., Takahashi, K.I., and Varnes, K.L., eds., 1995, 1995 National Assessment of United States oil and gas resources, Results, methodology, and supporting data: U.S. Geological Survey Digital Data Series 30 [CD-ROM]. Houghton, J.C., Dolton, G.L., Mast, R.F., Masters, C.D., and Root, D.H., 1993, U.S. Geological Survey estimation procedure for accumulation size distributions by play: Bulletin of the American Association of Petroleum Geologists, v. 77, no. 3, p. 454-466. Mast, R.F., Dolton, G.L., Crovelli, R.A., Root, D.H., Attanasi, E.D., Martin, P.E., Cooke, L.W., Carpenter, G.B., Pecora, W.C., and Rose, M.B., 1989, Estimates of undiscovered conventional oil and gas resources in the United States_A part of the Nation's energy endowment: U.S. Department of the Interior, U.S. Geological Survey and Minerals Management Service, 44 p. NRG Associates, Inc., 1992 [includes data current as of December 31, 1990] The Significant Oil and Gas Fields of the United States: Colorado Springs, Colo., NRG Associates, Inc., [database available from NRG Associates, Inc., P.O. Box 1655, Colorado Springs, CO 80901]. Petroleum Information Corp., 1993 and 1994 [includes data current as of December 31, 1992, and December 31, 1993, respectively], Well History Control System: Littleton, Colo., Petroleum Information Corp., [database available from Petroleum Information Corp., 4100 East Dry Creek Road, Littleton, CO 80122]. Petroleum Information Corp., 1994, Petro-ROM Production Data, August 1993-December 1993: Littleton, Colo., Petroleum Information Corp., [database available from Petroleum Information Corp., 4100 East Dry Creek Road, Littleton, CO 80122]. Root, D.H., and Attanasi, E.D., 1993, Small fields in the National Oil and Gas Assessment: Bulletin of the American Association of Petroleum Geologists, v. 77, no. 3, p. 485-490. U.S. Bureau of Mines and U.S. Geological Survey, 1980, Principles of a resource/reserve classification for minerals: U.S. Geological Survey Circular 831, 5 p.

U.S. Geological Survey Circular 1118