Columbia subject headings:
American bison--Control--Environmental aspects--Montana.
American bison--Control--Environmental aspects--Yellowstone National Park Region.
Brucellosis in animals--Montana.
Brucellosis in animals--Yellowstone National Park Region.
Harvard subject headings:
American bison--Control--Environmental aspects--Montana.
American bison--Control--Environmental aspects--Yellowstone National Park Region.
Brucellosis in animals--Montana.
Brucellosis in animals--Yellowstone National Park Region.
Princeton subject headings: