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- Agaves 3
- Airplanes 4
- Akeley motion picture camera 19
- Alder 1
- American Jays 17
- American robin 23
- Anas 80
- Animal burrowing 1
- Animal tracks 8
- Animal traps 1
- Antelopes 25
- Anthony, A. W. 1
- Apache Indians 2
- Apples 17
- Auks 75
- Automobiles 36
- Avocets 27
- Aythya 23
- Badgers 7
- Bailey, Florence Merriam, 1863-1948 10