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Concentration tests of manganese ores /
by A.L. Engel.

APA Citation

Engel, A. L. (1953). Concentration tests of manganese ores. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines.

MLA Citation

Engel, Abraham L. Concentration Tests of Manganese Ores. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines, 1953.

Warning: These citations may not always be complete (especially for serials).