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1. Map of mineral resources of Minnesota, 1954

1954. Schwartz, George M. and Prokopovich, N. Mineral resources map of Minnesota, scale 1:1,000,000.

2. Map of mineral resources of Minnesota, 1956

1956. Schwartz, George M. and Prokopovich, N. Mineral resources map of Minnesota, scale 1:1,000,000.

3. Map of mineral resources of Minnesota, 1966 (revised from 1956 edition)

1966. Schwartz, George M. and Prokopovich, N. Mineral resources map of Minnesota, scale 1:1,000,000.