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Precambrian basement of the north Mid-Continent U.S.A.: a digital representation of the 1990 P.K. Sims map
Geologic units, structural features, drill hole locations, and structure contours |
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Rare earth element occurrences in the United States
Detailed descriptions of more than 200 mineral districts, mines, and mineral occurrences (deposits, prospects, and showings) within the United States that are reported to contain substantial enrichment of rare earth elements. |
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