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1
Reduction mills in Montana in 1925
Published 1927“…[publisher not identified],…”
Government Document Microfilm Book -
2
Milling methods and costs at Spring Hill concentrator of Montana Mines Corporation, Helena, Mont
Published 1931“…[publisher not identified],…”
Government Document Microfilm Book -
3
Milling methods at Hughesville concentrator of St. Joseph Lead Co., Hughesville, Mont
Published 1931“…[publisher not identified],…”
Government Document Microfilm Book