http://dewey.info/scheme/a14/
567 Fossil cold-blooded vertebrates    Fossil fishes
567.9 Reptiles
567.91 Specific dinosaurs and other archosaurs
http://dewey.info/scheme/edition/e23/
567 Fossil cold-blooded vertebrates
567.9 Reptilia
567.903 Dinosaurs--encyclopedias 567.90994 Dinosaurs--Australia 567.91 Specific dinosaurs and other Archosauria 567.92 Anapsida 567.93 Euryapsida, Synapsida; Mesosauria 567.94 Lepidosauria 567.95 Sauria 567.96 Serpentes 567.98 Crocodilia
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