General view of employee A. Sherwood preparing agar and gelatin plates for use in the bacteriological analysis of water at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of BetzDearborn, Incorporated best known for manufacturing water treatment chemicals for use in boilers and cooling towers.
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Dearborn Chemical Company. “Bacteriological Analysis at Dearborn Laboratory Facility,” circa 1930. BetzDearborn, Incorporated Records, Box 17, Folder 13. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/b2773w797.
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