Williams, Brown & Earl was an American optical instrument and laboratory supply firm formed by H. S. Williams and N. H. Brown at 918 Chestnut Street, Philadelphia, Pennsylvania. This illustrated catalog includes the description and price of the instrument manufacturer's stock. Digitized content includes 9 illustrations and the work's front matter.
Williams, Brown. “Catalog of Laboratory Apparatus and Reagents for Industrial, Medical, Educational Laboratories.” Philadelphia, Pennsylvania: Brown Williams, 1922. Q185.7 .W55 1922. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1jlzom2.
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