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Geologic map and sections of the S.E. 1/4 Trinity Lake 15-minute quadrangle, Trinity County, California
Trinity Dam quadrangle, Trinity County, California
1 map : color ; 58 x 44 cm. folded in envelope 30 x 23 cm.
"Geology mapped by Philip A. Lydon and Ira E. Klein 1955-1964."
"The Trinity Lake quadrangle will be known in the future as the Trinity Dam quadrangle."
Includes 5 cross sections and location maps.
Map sheet (California. Division of Mines and Geology) ; 12