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1
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2Published 1982Government Document Map
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3Map showing availability of data for selected deep drill holes in the northern midcontinent, U.S.A /Published 1986Government Document Map
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4
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5Published 1989Government Document Map
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6
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7
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8
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9Published 1990Government Document Map
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10
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11
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12
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13
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14
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15
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16Published 1990Government Document Map
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17Published 1990Government Document Map
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18
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19Published 1991Government Document Map
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20