http://dewey.info/scheme/a14/
597 Cold-blooded vertebrates    Fishes
597.3 Selachii
http://dewey.info/scheme/edition/e23/
597 Cold-blooded vertebrates
597.3 Selachii, Holocephali, Sarcopterygii
597.30723 Shark watching 597.317757 Sharks--Australia 597.33 Lamnidae 597.34 Carcharhinidae 597.35 Rajiformes (Batoidei) 597.36 Dogfishes 597.38 Holocephali 597.39 Sarcopterygii (Fleshy-finned fishes)
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