Columbia subject headings:
Harvard subject headings:
Amphibians--Central America--Bibliography.
Amphibians--Central America.
Amphibians--Mexico--Bibliography.
Amphibians--Mexico.
Reptiles--Central America--Bibliography.
Reptiles--Central America.
Reptiles--Mexico--Bibliography.
Reptiles--Mexico.
Princeton subject headings:
Amphibians--Central America--Bibliography.
Amphibians--Central America.
Amphibians--Mexico--Bibliography.
Amphibians--Mexico.
Reptiles--Central America--Bibliography.
Reptiles--Central America.
Reptiles--Mexico--Bibliography.
Reptiles--Mexico.