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_P4_ <br />References Cited <br />Beekly, A.L., 1915, Geology and coal resources of North Park, Colorado: <br />U.S. Geological Survey, Bulletin 596, 121 p. <br />Hail, W.J., Jr., 1968, Geology of Southwestern North Park and vicinity, <br />Colorado: U.S. Geological Survey Bulletin 1257. <br />Kerr Coal Company, 1980, Marr Strip permit application to the Colorado <br />Mined Land Reclamation division, File C-006-80 <br />Kuhn, Gerhard, 1982, Statistical summaries of water quality data for two <br />coal areas of Jackson County, Colorado: U.S. Geological Survey Open <br />File Report 82-121, 23 p. <br />Madden, D.H., 1978, Exploration drilling in the Coalmont coal field, <br />Jackson County, Colorado, June-November, 1977: U.S. Geological Survey <br />Open File Report 77-887, 138 p. <br />Madden, D.M., 1978, Exploration drilling in the McCallum coial field, <br />Jackson County, Colorado, August-November, 1977: U.S. Geological Survey <br />Open File Report 77-888, 80 p. <br />Tweto, Ogden, 1976, Geologic map of the Craig 1o by 20 quadrangle: <br />U.S. Geological Survey Map No. I-972. <br />Walden Coal Company, 1981, Bourg Coal permit application to the Colorado <br />Mined Land Reclamation Division, File C-021-81 <br />Wyoming Fuel Company, 1981, Canadian Strip permit application to the <br />Colorado Mined Land Reclamation Division, File C-026-81 <br />