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- Portraits63
- Chemists39
- Industrialists16
- Portrait photography16
- Chemical engineers12
- Chemical industry10
- Chemistry, Organic8
- Monsanto Chemical Company7
- Chemical engineering6
- E.I. du Pont de Nemours & Company6
- Petroleum5
- Monsanto Chemical Works4
- Queeny, Edgar M. (Edgar Monsanto), 1897-19684
- Research, Industrial4
- Chemistry3
- Dorr, John Van Nostrand, 1872-19623
- Inventors3
- Massachusetts Institute of Technology3
- Perkin, William Henry, Jr., 1860-19293
- American Chemical Society2