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Geology and zinc-lead deposits in the Durango area, Dubuque County, Iowa
Arthur E. Flint, C. Erwin Brown
1955, Miscellaneous Field Studies Map 33
Geologic investigations were begun in Iowa to appraise; (1) the possible occurrence of zinc ore in strata that elsewhere in the Upper Mississippi Valley zinc-lead district have been the principal sites of zinc concentration; and (2) lead ore of the type known as "crevice deposits," which were mined so extensively...
Preliminary geologic map of the Paris-Bloomington vanadium area, Bear Lake County, Idaho
V.E. McKelvey, J.D. Strobell Jr.
1955, Miscellaneous Field Studies Map 41
The Permian Phosphoria formation in the vicinity of the towns of Paris and Bloomington, Bear Lake County, Idaho, contains large tannages of vanadiferous mudstone and phosphorite.  The area underlain by these rocks was mapped in 1943 as a guide to the exploration of the vanadiferous zone then being conducted by...
Geologic map of the Triangle A pegmatite, Custer County, South Dakota
A.J. Lang Jr.
1955, Miscellaneous Field Studies Map 44
The Triangle A pegmatite is 4 miles southeast of Custer in the SW 1/4, sec. 34, T. 3 S., R. 5 E., Custer County, S. Dak.  It may be reached from Custer by a gravel road 2.4 miles long that leaves U.S. Highway 16A at a point 3.2 miles east...