National silicosis conference ... :
Final report[s] of the committee[s].
Washington : U. S. Govt. print. off, 1938.
Lungs > Lungs / Dust diseases > Lungs / Dust diseases / Congresses.
List of references in parts 1 and 2.
At head of title: United States Department of labor. Frances Perkins, secretary. Division of labor standards. Verne A. Zimmer, director.
4 volumes :
map, tables (part folded), diagram ;
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