http://dewey.info/scheme/edition/e23/ en
156 Comparative psychology
156.2 Comparative psychology of sensory perception, movement, emotions, physiological drives of animals
156.21 Sensory perception--comparative psychology 156.23224 Conditioned reflexes--comparative psychology
http://dewey.info/scheme/edition/e22/ de
156 Vergleichende Psychologie
156.2 Vergleichende Psychologie der Sinneswahrnehmung, Bewegung, Emotionen, physiologischen Triebe von Tieren
156.21 Sinneswahrnehmung—vergleichende Psychologie 156.23224 Konditionierte Reflexe—vergleichende Psychologie
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