General view of employee Al Herman analyzing an unidentified substance at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Assorted scientific apparatus and laboratory glassware…

General view of employee William A. Converse seated in his office at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a…

General view of unidentified female employees at work in the stenographic office space at the Dearborn Chemical Company 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the Dearborn…

General view of company president Robert F. Carr, Sr. seated in his office at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a…

Close-up view of company president Robert F. Carr, Sr. seated in his office at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was…

Close-up view of company president Robert F. Carr, Sr. seated in his office at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was…

Close-up view of employee Olive Bissell seated at her desk in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

General view of an office space at the Dearborn Chemical Company 35th Street laboratory facilities located in Chicago, Illinois. A partial view of one of the laboratory spaces is visible through the doorway. The…

General view of the office of Laboratory Director Dudley Kimball French (center) at the Dearborn Chemical Company 35th Street laboratory facilities located in Chicago, Illinois. The female employees visible in the…

General view of employees at work in the library at the Dearborn Chemical Company 35th Street laboratory facilities located in Chicago, Illinois. The male employees are identified as C.C. Dennis (left) and A.H. Reynolds…

General view of the laboratory office space at the Dearborn Chemical Company 35th Street laboratory facilities located in Chicago, Illinois. The employees seated at the desks are identified as A.H. Reynolds (left) and…

Close-up view of employee J.W. Harkins seated at his desk at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

Close-up view of employee J.D. Purcell seated in his office at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

General view of the information desk at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. The employees visible in the photograph are identified as J. Beckerley (seated) and C.M.…

Close-up view of employee George R. Carr seated in his office at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

Close-up view of employee Fred L. Baker seated in his office at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

General view of Eva Vaughn (left) and an unidentified employee at work in an office space at the Dearborn Chemical Company 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the Dearborn…

General view of male and female employees at work 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…

General view of employees at work in an office at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. The employees seated at the desks are identified as John W. Brashears (left) and…

General view of male and female employees at work in an office space at the Dearborn Chemical Company 35th Street laboratory facilities located in Chicago, Illinois. While the two female employees closest to the camera…

General view of employees E.P. Fager and Viola Suess at work in an office at the Dearborn Chemical Company's 35th Street laboratory facility located in Chicago, Illinois. An unidentified chemist, visible through the…

Close-up view of employee E.M. Converse seated in his office at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

Close-up view of employee E.M. Converse seated in his office at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

General view of employee Dudley Kimball French at work in the offices at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a…

General view of employee C.M. Hoffman seated in his office at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…