Columbia subject headings:
Caves--Research--New Mexico.
Karst--Research--New Mexico.
National Cave and Karst Research Institute (U.S.)
Speleology--Research--New Mexico.
Harvard subject headings:
Caves--Research--New Mexico.
Karst--Research--New Mexico.
National Cave and Karst Research Institute (U.S.)
Speleology--Research--New Mexico.
Princeton subject headings: