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Publication Extents

Not all publications have extents, not all extents are completely accurate
Geologic map of the Mount Abbot quadrangle, central Sierra Nevada, California
John P. Lockwood, Phillip A. Lydon
1975, Geologic Quadrangle 1155
The Mount Abbot quadrangle comprises about 240 square miles of high montane to alpine terrain straddling the Sierra Nevada crest between Fresno and Bishop, California. About three-fourths of the quadrangle lies in the John Muir Wilderness, and the famous John Muir Trail, travelled by thousands of vacationers each summer, crosses...
Map showing fluorspar deposits in Colorado
Bruce T. Brady (compiler)
1975, Mineral Investigations Resource Map 70
Increased fluorine consumption (U.S. Bureau of Mines, 1946-1971) coupled with limited proved reserves has stimulated extensive exploration for fluorine and intensive research into developing new sources of fluorine or substitutes. A summary of the distribution, geochemical and geologic environments, and production history of selected fluorspar occurrences, deposits, and districts is provided here with the hope that this information...