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    • circa 1900

    Elevated view of a laboratory, presumably the chemistry laboratory at the Drexel Institute of Art, Science, and Industry (later Drexel University), showing several rows of shelves containing assorted ingredients and raw…

    • circa 1900

    General view of chemist Ernest Arnold Congdon (right) in the chemistry laboratory at the Drexel Institute of Art, Science, and Industry (later Drexel University) in Philadelphia. Several laboratory stations with…

    • after 1901 – 1928

    General view of an employee in the Bureau of Chemistry's Water and Beverage Laboratory conducting an analysis on an unidentified substance. Assorted sample jars and scientific apparatus are visible in the photograph.…

    • 1901 – before 1928

    General view of three employees at work in the Bureau of Chemistry's Naval Stores Investigation Laboratory, a division of the Leather and Paper Laboratory. Assorted laboratory glassware and apparatus, as well as notices…

    • 1901 – before 1928

    General view of two employees at work in an Agricultural Research Service Drug Laboratory, with view of assorted laboratory glassware and apparatus. Part of the U.S. Department of Agriculture, such laboratories commonly…

    • 1901 – before 1928

    General view of two employees at work in a Bureau of Chemistry Drug Laboratory, with view of assorted laboratory glassware and apparatus. Part of the U.S. Department of Agriculture, such laboratories commonly…

    • 1901 – before 1928

    General view of an employee conducting an analysis of an unidentified substance in the Bureau of Chemistry's Nitrogen Laboratory. Part of the U.S. Department of Agriculture, the Nitrogen Laboratory conducted…

    • 1901 – before 1928

    General view of an employee conducting an analysis of an unidentified substance in the Bureau of Chemistry's Nitrogen Laboratory. Part of the U.S. Department of Agriculture, the Nitrogen Laboratory conducted…

    • 1901 – before 1928

    General view of the Bureau of Chemistry's Nitrogen Laboratory showing assorted laboratory glassware and apparatus. Part of the U.S. Department of Agriculture, the Nitrogen Laboratory conducted investigations into…

    • 1901 – before 1928

    General view of an employee operating an apparatus used to study ammonia at the Bureau of Chemistry's Nitrogen Laboratory. Part of the U.S. Department of Agriculture, the Nitrogen Laboratory conducted investigations…

    • 1901 – before 1928

    General view of two employees working in the Bureau of Chemistry's Oil, Fat, and Wax Laboratory, with view of assorted laboratory glassware and apparatus. Part of the U.S. Department of Agriculture, the Oil, Fat, and…

    • 1901 – before 1928

    General view of an employee utilizing an apparatus in the Bureau of Chemistry's Dust Laboratory. Part of the U.S. Department of Agriculture's Office of Development Work, the Dust Laboratory conducted research into the…

    • circa 1905

    General view of a portion of the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois, with view of furnaces, assorted balances, and…

    • circa 1905

    Close-up view of the bucking board and crusher used to prepare coal and ore samples for analysis at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in…

    • circa 1905

    Close-up view of the assay and combustion furnaces in the laboratory back room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois.…

    • circa 1905

    General view of the drug storage room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the Dearborn Chemical…

    • circa 1905

    General view of the main room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois, with view of assorted glassware and scientific…

    • circa 1905

    Close-up view of assorted scientific instruments, including microscopes and balances, used at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago,…

    • circa 1905

    View of a portion of the main room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Per notations accompanying the photograph, the…

    • circa 1905

    General view of a section of the main room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois, with view of assorted glassware and…

    • circa 1905

    Close-up view of two balances used at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the Dearborn Chemical Company…

    • circa 1905

    General view of a section of the main room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois, with view of assorted glassware and…

    • circa 1905

    Close-up view of assorted scientific instruments used at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the…

    • circa 1905

    General view of a section of the main room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois, with view of assorted glassware and…

    • circa 1905

    Close-up view of scientific apparatus used at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the Dearborn Chemical…