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41by Schmidt, Robert George“...Geological Survey bulletin ;...”
Published 1978
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42by Condit, Christopher D.“...Geological Survey bulletin ;...”
Published 1979
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43
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44
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45
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46Published 1979“...Geological Survey bulletin ;...”
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47
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48“...Geological Survey bulletin ;...”
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49
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50by Cunningham, Charles G.“...Geological Survey bulletin ;...”
Published 1979
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51
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52
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53
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54by Richmond, Gerald Martin, 1914-“...Geological Survey bulletin ;...”
Published 1978
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55Published 1979“...Geological Survey bulletin ;...”
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56by Gard, Leonard Meade, 1923-“...Geological Survey bulletin ;...”
Published 1980
Government Document Book -
57by Van Alstine, Ralph Erskine, 1914-“...Geological Survey bulletin ;...”
Published 1980
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58
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59“...Geological Survey bulletin ;...”
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60by Hadley, Jarvis B. (Jarvis Bardwell), 1909-“...Geological Survey bulletin ;...”
Published 1980
Government Document Book