Interior view of the jigger room at the Pacific Clay Products factory in Los Angeles, 1934 

Factory interior of the Pacific Clay Products Company's Plant #4, ca.1934 

Unidentified factory interior, showing workers adjusting a small slab beneath a large machine, ca.1930 

Interior of the California Clay Products Company, ca.1930 

Close-up view of factory worker adjusting a lidded piece of machinery, ca.1950 

Factory workers operating on machinery, showing pallet of buckets in foreground, ca.1930 

Factory exterior of Pacific Clay Products, May 1928 

Man working at the Morris Stamping and Manufacturing Company, in February 1938 

Workers showing a method of pipe bending at the Crane Company, ca.1920 

Exterior of the Consolidated Rock Products Company, April 1929 

Interior view of unidentified factory, showing a single worker standing near the turbines, ca.1935 

Worker at the Reed and Reese Incorporated plant in Pasadena, ca.1950 

Interior view of a factory, showing large hydraulic press at center, May 1937 

Lines of women workers at the Acme Electronics company, showing a man standing in the foreground, ca.1940 

Woman factory worker sorting wrapped candy at a table, ca.1940 

Two unidentified workers lowering chains in a factory, ca.1930 

Interior view of unidentified factory, showing piles of fabric in the foreground, ca.1940 

Pacific Portland Cement Company's Plaster City Plant, showing cinder blocks in foreground, ca.1940 

Several men at the National Supply Company factory interior, ca.1930 

Man inside a piece of "32 ton Mill housing" at the Llewellyn Iron Company, ca.1930