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41by Muir, Neal M.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1947
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42by Wright, Wilford S.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1947
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43by Toenges, Albert L. (Albert Louis), 1889-“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1947
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44by Traver, W. M.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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45Published 1948“...Report of investigations (United States. Bureau of Mines) ;...”
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46by Thomas, Bruce I.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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47by Thomas, Bruce I.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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48by Heide, Harold E.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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49by Thorne, Robert L.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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50Published 1948“...Report of investigations (United States. Bureau of Mines) ;...”
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51by Bjorklund, Stuart“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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52Published 1948“...Report of investigations (United States. Bureau of Mines) ;...”
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53by Rutledge, F. A. (Franklin A.)“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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54by Rutledge, F. A. (Franklin A.)“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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55by Erickson, Aner W.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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56by Rutledge, F. A.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1946
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57by Herdlick, J. A.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1949
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58“...Report of investigations (United States. Bureau of Mines) ;...”
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59by Knox, Clinton C.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1949
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60“...Report of investigations (United States. Bureau of Mines) ;...”
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