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- 68061640%2F%2Fr86 contributor B1871138.
- 68061640%2F%2Fr86 contributor B1871139.
- 68061640%2F%2Fr86 created "1968]".
- 68061640%2F%2Fr86 date "1968".
- 68061640%2F%2Fr86 date "1968]".
- 68061640%2F%2Fr86 dateCopyrighted "1968]".
- 68061640%2F%2Fr86 description "Bibliography: p. 28.".
- 68061640%2F%2Fr86 extent "iii, 53 p.".
- 68061640%2F%2Fr86 isPartOf "Information circular (United States. Bureau of Mines) ; 8347.".
- 68061640%2F%2Fr86 isPartOf "United States. Bureau of Mines. Information circular ; 8374".
- 68061640%2F%2Fr86 issued "1968".
- 68061640%2F%2Fr86 issued "1968]".
- 68061640%2F%2Fr86 language "eng".
- 68061640%2F%2Fr86 publisher "[Washington] U.S. Dept. of the Interior, Bureau of Mines; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.,".
- 68061640%2F%2Fr86 subject "338.4/7/622342".
- 68061640%2F%2Fr86 subject "Gold Metallurgy.".
- 68061640%2F%2Fr86 subject "Gold mines and mining.".
- 68061640%2F%2Fr86 subject "TN295 .U4 no. 8374".
- 68061640%2F%2Fr86 title "An engineering and economic study of a gold mining operation, by Edward E. Johnson and Harold J. Bennett.".
- 68061640%2F%2Fr86 type "text".