Soggetti all'interno della tua ricerca.
Soggetti all'interno della tua ricerca.
1
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Documento governativo
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2
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3
4
5
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6
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7
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8
9
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10
11
Washington, DC : U.S. Dept. of the Interior, Bureau of Mines, 1989
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12
13
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14
15
16
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17
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18
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19
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20
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