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- Scientific apparatus and instruments98
- Employees96
- United States. Bureau of Chemistry and Soils84
- Bredig, Max Albert, 1902-197782
- Laboratories71
- Bredig, Georg, 1868-194470
- United States. Department of Agriculture67
- Nitrogen fertilizer industry62
- Nitrogen--Fixation61
- Chemical industry41
- Chemists41
- Corporations39
- Glassware33
- Dearborn Chemical Company32
- Chemistry28
- Women employees24
- Fajans, Kasimir, 1887-197523
- Drugs17
- Haber, Fritz, 1868-193417
- Machinery15