Experimental extraction of gold and silver from California and Nevada ores /
by A.L. Engel and H.J. Heinen.
APA Citation
Engel, A. L., Heinen, H. J. (Harold J.). (1961). Experimental extraction of gold and silver from California and Nevada ores. [Washington, DC]: U.S. Dept. of the Interior, Bureau of Mines.
MLA Citation
Engel, Abraham L, and H. J. (Harold J.) Heinen. Experimental Extraction of Gold And Silver From California And Nevada Ores. [Washington, DC]: U.S. Dept. of the Interior, Bureau of Mines, 1961.
Warning: These citations may not always be complete (especially for serials).