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    • 1930s

    General view of two unidentified employees filling barrels at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

    • 1930s

    General view of Dearborn Chemical Company employee E.P. Fager comparing the color of two solutions during a water sample field test. Assorted glassware and a Dearborn portable testing cabinet are visible on the table.…

    • 1930s

    General view of Dearborn Chemical Company employee C.B. Smith utilizing a concentration hydrometer during a water sample field test. Assorted glassware and a Dearborn portable testing cabinet are also visible on the…

    • 1930s

    General view of two unidentified men utilizing a Dearborn Chemical Company portable testing cabinet to conduct a water sample field test. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

    • 1930s

    General view of Dearborn Chemical Company engineer F.B. Horstmann utilizing a portable testing cabinet to conduct a water sample field test. A stamp on the verso of the photograph for "The Fensholt Company," a public…

    • 1930s

    General view of Dearborn Chemical Company employee E.P. Fager preparing a water sample for testing. A stamp on the verso of the photograph for "The Fensholt Company," a public relations firm based in Chicago, suggests…

    • 1930s

    General view of employee Charles S. White analyzing unidentified substances at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Assorted scientific apparatus and laboratory…

    • 1930s

    General view of employee Ted Slisz at work in the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. An assortment of beakers is visible on the work bench. Founded in 1887, the Dearborn…

    • 1931

    Exterior view of the Cooper Shop at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of Philadelphia, Pennsylvania.…

    • 1931

    Exterior view of a section of the sodium nitrate storage and nitric acid plant at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the…

    • 1931

    Exterior view of a section of the Leukanol and Sorbanol manufacturing facility (Building 2) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River…

    • 1931

    Exterior view of the southeast corner of the Leukanol and Sorbanol manufacturing facility (Building 2) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the…

    • 1931

    Exterior view of a section of the nitric acid manufacturing facility (Building 15) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the…

    • 1931

    Exterior view of a section of the muriatic manufacturing facility at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of…

    • 1931

    Exterior view of a section of the zinc chloride manufacturing facility (Building 4) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the…

    • 1931

    Exterior view of the copper oxide and bauxite silos (Building 5) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of…

    • 1931

    Exterior view of the west side of the aluminum plant at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of…

    • 1931

    Exterior view of the copper oxide, bauxite silos, and bauxite grinding facilities (Building 5) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware…

    • 1931

    Exterior view of the southeast corner of the aluminum plant at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of…

    • 1931

    Exterior view of the storeroom (Building 18) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of Philadelphia,…

    • 1931

    Exterior view of a section of the sodium sulfide manufacturing facility (Building 26) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the…

    • 1931

    Exterior view of a section of the aluminum-chloride department at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of…

    • 1931

    Exterior view of a section of the sodium sulfide crystals manufacturing facility (Building 30) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware…

    • 1931

    Exterior view of a section of the semi-works at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of Philadelphia,…

    • 1931

    Exterior view of the road and railroad track running between the copper oxide and aluminum manufacturing facilities at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located…