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Page 5617, results 140401 - 140425

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Publication Extents

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Map showing mined areas of the Boulder-Weld coal field, Colorado
Roger B. Colton, R.L. Lowrie
1973, Miscellaneous Field Studies Map 513
Compiled by Raymond E. Lowrie, U.S. Bureau of Mines (1966), and revised by Roger B. Colton, U.S. Geological Survey, assisted by Harold R. Fitch, 1972.In the revision of this map, many mine maps and two unpublished general small-scale maps of the area by F. H. Canis (deceased) and Samuel Tescher...
Contour map of the bedrock surface, Ludlow Quadrangle, Massachusetts
Clark J. Londquist
1973, Miscellaneous Field Studies Map 503-A
Contours show the altitude of the bedrock surface.  The position of the contours is based largely on data from wells and test holes supplemented by knowledge of the geologic history of the region.The map show the configuration of the bedrock surface if all unconsolidated earth materials were removed....