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Subclass QL
| QL1-991 | Zoology | ||
| QL1-355 | General Including geographical distribution | ||
| QL360-599.82 | Invertebrates | ||
| QL461-599.82 | Insects | ||
| QL605-739.8 | Chordates. Vertebrates | ||
| QL614-639.8 | Fishes | ||
| QL640-669.3 | Reptiles and amphibians | ||
| QL671-699 | Birds | ||
| QL700-739.8 | Mammals | ||
| QL750-795 | Animal behavior | ||
| QL791-795 | Stories and anecdotes | ||
| QL799-799.5 | Morphology | ||
| QL801-950.9 | Anatomy | ||
| QL951-991 | Embryology | ||
