The National safety competition of 1959 /
by John C. Machisak, Virginia E. Wrenn, and Elizabeth K. Elsner.
APA Citation
Machisak, J. C., Elsner, E. K., Wrenn, V. E., United States. Bureau of Mines. (1961). The National safety competition of 1959. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines.
MLA Citation
Machisak, John C, Elizabeth K Elsner, Virginia E Wrenn, and United States. Bureau of Mines. The National Safety Competition of 1959. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines, 1961.
Warning: These citations may not always be complete (especially for serials).