Columbia subject headings:
Harvard subject headings:
Animals (Philosophy)--History.
Animals and civilization
Animals--Social aspects.
Civilization--History
Frogs--History.
Human ecology
Human-animal relationships--History
Princeton subject headings:
Animals (Philosophy)--History.
Animals and civilization.
Animals--Social aspects.
Civilization--History.
Frogs--History.
Human ecology.
Human-animal relationships--History.