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81Published 1983Government Document Book
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82Published 1988Government Document Book
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83Published 1984Government Document Map
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84
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85
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86
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87Published 1991Government Document Book
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88
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89
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90
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91
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92Published 1995“...Western United States mine dump data retrievals...”
Adobe Acrobat Reader required
Government Document Book -
93
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94
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95
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96
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97
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98
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99
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100