Columbia subject headings:
Harvard subject headings:
Competition (Biology)--Great Basin.
Mammal populations--Great Basin.
Mammals--Behavior--Great Basin.
Mammals--Ecology--Great Basin.
Wild horses--Behavior--Great Basin
Wild horses--Ecology--Great Basin.
Princeton subject headings:
Competition (Biology)--Great Basin.
Mammal populations--Great Basin.
Mammals--Great Basin--Behavior.
Mammals--Great Basin--Ecology.
Wild horses--Behavior--Great Basin.
Wild horses--Great Basin--Ecology.