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1Published 1997“...USGS ;...”
Government Document Conference Proceeding Microform Book -
2Published 1986“...[USGS],...”
Government Document Microform Book -
3
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4Published 1998“...USGS,...”
Government Document Book -
5Published 1997“...[USGS],...”
Government Document Book -
6
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7
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8Published 1999“...USGS,...”
Government Document Microform Book -
9Published 2000“...USGS,...”
Government Document Software eBook -
10Published 1999“...USGS,...”
Government Document Map -
11
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12Published 1999“...USGS,...”
Government Document Book -
13
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14
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15
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16
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17
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18
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19
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20