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- Scientific apparatus and instruments82
- Bredig, Georg, 1868-194460
- Chemists42
- Chemistry36
- Laboratories--Equipment and supplies34
- Scientific illustration31
- Chemical apparatus29
- Microscopy21
- Water--Analysis21
- Employees20
- Laboratories20
- United States. Bureau of Chemistry and Soils20
- Drugs19
- Microorganisms19
- Biological laboratories--Equipment and supplies18
- Chemical laboratories--Equipment and supplies18
- Nobel Prize winners18
- Portraits17
- Dyes and dyeing16
- Glassware16