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Subjects
- Books25
- Emotions -- physiology12
- Pamphlets10
- Facial Expression9
- Biological Evolution8
- Sex Characteristics8
- Genetic Variation6
- Birds5
- Dogs5
- Aggression -- physiology4
- Pigmentation4
- Feathers -- anatomy & histology3
- Hominidae3
- Insects3
- Reptiles3
- Women3
- Adaptation, Biological2
- Anthropology, Physical2
- Attention -- physiology2
- Beagle (Ship)2