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Author
Prokopovich, N.
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Institution
Minnesota
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Year
1954
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1. Groundwater map of Minnesota
1954. Thiel, George A. and Prokopovich, N. Ground water map of Minnesota, scale 1:2,000,000.
2. Map of mineral resources of Minnesota, 1954
1954. Schwartz, George M. and Prokopovich, N. Mineral resources map of Minnesota, scale 1:1,000,000.