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3
Geological Survey (U.S.),
1
Bass, N. Wood 1893-1979,
1
Frederic, W. H.
1
Geological Survey (U.S.)
1
Horn, George H. 1917-
1
Ode, W. H. 1905-
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1
Smith, H. L.
1
United States. Bureau of Labor Statistics. Office of Employment and Unemployment Statistics
1
United States. Bureau of Land Management. Portland Service Center,
1
United States. Bureau of Mines
1
United States. Bureau of Mines,
1
Wood, Gordon H. 1919-
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