The extensive collection of Hercules advertising materials, covering the years 1913 through 1952, documents the company's growth as a major manufacturer of chemical products. A portion of the 1938 edition is digitized here with content primarily devoted to naval stores products marketed for use in insecticides and disinfectants, including Yarmor Pine 302 Oil, and D.H.S. Activator.
Hercules Incorporated. “1938 Hercules Advertisements,” 1938. Records of Hercules Incorporated, Volume 1938. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/12579s82f.
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