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41by Maloney, Raymond P.“...U.S. Department of the Interior, Bureau of Mines,...”
Published 1967
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42by Ageton, Robert W.“...U.S. Department of the Interior, Bureau of Mines,...”
Published 1967
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43
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44
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46by Fried, Arthur N.“...U.S. Department of the Interior, Bureau of Mines,...”
Published 1961
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47
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48
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49by Maloney, Raymond P.“...U.S. Department of the Interior, Bureau of Mines,...”
Published 1962
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50by Warfield, R. S.“...U.S. Department of the Interior, Bureau of Mines,...”
Published 1962
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51
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52by Mulligan, John J.“...U.S. Department of the Interior, Bureau of Mines,...”
Published 1962
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53
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54by Riggs, C. H. (Calvin Harold), 1905-“...U.S. Department of the Interior, Bureau of Mines,...”
Published 1963
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55by Maloney, Raymond P.“...U.S. Department of the Interior, Bureau of Mines,...”
Published 1962
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56
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57by Berryhill, Robert V.“...U.S. Department of the Interior, Bureau of Mines,...”
Published 1963
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58by Hazen, Scott W.“...U.S. Department of the Interior, Bureau of Mines,...”
Published 1963
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59by Mulligan, John J.“...U.S. Department of the Interior, Bureau of Mines,...”
Published 1966
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60