Prospecting and exploration for sand and gravel

Author: Thoenen, J. R.
Year: 1932
Document Type: USBI
Issuing Agency: U.S. Dept. of Commerce, Bureau of Mines,
SUDOC: C 22.11:6668
Series: Information circular / Bureau of Mines ;
Report Number: 6668
Subjects: Sand and gravel mines and mining
Prospecting--Geophysical methods
Link: https://hdl.handle.net/2027/mdp.39015086485797

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