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61by Lowham, H. W.“...U.S. Geological Survey,...”
Published 1988
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62
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63
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64by Engelke, Morris J.“...U.S. Geological Survey,...”
Published 1978
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65
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66by Steele, Timothy Doak“...U.S. Geological Survey,...”
Published 1979
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67
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68by Butler, David L. (David Louis), 1946-“...U.S. Geological Survey,...”
Published 1987
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69by Rankl, James G.“...U.S. Geological Survey,...”
Published 1987
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70
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71
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72
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73
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74
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75
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76by Lines, Gregory C.“...U.S. Geological Survey,...”
Published 1976
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77by Lowham, H. W.“...U.S. Geological Survey,...”
Published 1976
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78by Daddow, Richard L.“...U.S. Geological Survey,...”
Published 1996
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79
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