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Creator
- 1102 National Organization for Black Chemists and Chemical Engineers1
- A L'imprimerie Impériale1
- A Step Ahead Prosthetics1
- A. C. Rogers Company10
- A. Hoen & Co.1
- A.C. Gilbert Company19
- A.J. Tiffany1
- A.S. Aloe Company4
- ACME18
- ADN Zentralbild1
- Abbott Laboratories1
- Abegg, R. (Richard), 1869-19103
- Abel Games, Ltd.1
- Aberdeen University Press3
- Abney, William de Wiveleslie, Sir, 1843-19201
- Academic Press1
- Academic Publishing Society Leipzig1
- Academy of Natural Sciences of Philadelphia1
- Académie royale des sciences (France)2
- Accum, Friedrich Christian, 1769-183821