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Creator
- Library of Congress. Legislative Reference Service1
- Mackaman, Frank H.1
- Nelson, Donald Marr, 1888-19591
- Parish, W.S.1
- Rice, W.E.1
- Rickard, W.L.1
- Robinson, Harold G., 1902-1
- Roosevelt, Franklin D. (Franklin Delano), 1882-19451
- Rosenbaum, William E.1
- Stover, C. T.1
- Stover, W. P.1
- Stubblefield, D. W. (Daniel W.)1
- Tredwill, John, Jr.1
- United States. Bureau of Mines1
- Wallgren, Monrad C. (Monrad Charles), 1891-19611
