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Production, employment, and output per man in gypsum mining

Published Year

• 1940-1949 (1)

Subject

• Gypsum industry--United States (1)
• Gypsum mines and mining--United States (1)
• Gypsum--United States (1) *

Author

• Newcomb, Robinson, (1)
• Peterson, Knute. (1) *

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