Alice Helen Frankel.
Mechanics. (Occupational briefs on America's major job fields, no. 48)
R660311. Mechanics. By Alice Helen Frankel. (Occupational briefs on America's major job fields, no. 48) NM: revisions, updating & additions. © 10May49; AA117481. Science Research Associates, Inc. (PWH); 31Mar77; R660311.
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