Progress reports - metallurgical division.
27,
Ore-testing studies, 1937-38 /
by the staff of the Metallurgical Division.

APA Citation

United States. Bureau of Mines. Metallurgical Division. (1938). Progress reports - metallurgical division. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines.

MLA Citation

United States. Bureau of Mines. Metallurgical Division. Progress Reports - Metallurgical Division. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines, 1938.

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