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Creator
- ADN Zentralbild1
- Academic Publishing Society Leipzig1
- Ad Hoc Committee for the Professional Advancement of Black Chemists and Chemical Engineers1
- Aerial Eye, Inc.1
- Air Pollution Policy Committee1
- Alder, Ernst M. , 1906-1
- Alexander, Jerome, 1876-19593
- Allan Dean Walker Photography1
- Allgemeine Treuhand-Stelle fur die Judische Auswanderung2
- American Chemical Society1
- American Express Company6
- American Flying Services Foundation2
- American Society of European Chemists and Pharmacists3
- Ames Company3
- Aminoff, Gregori, 1883-19471
- Anderson, Ernest G.1
- Anderson, Weston Arthur1
- Ann Arbor Savings and Commercial Bank5
- Anonymous1
- Antropoff , Andreas von, 1878-19562