Columbia subject headings:
Conservation of natural resources--United States.
Mountaineering--United States.
Natural history--United States.
Sierra Club.
Sierra Nevada (Calif. and Nev.)
Harvard subject headings:
Conservation of natural resources--United States.
Mountaineering--United States.
Natural history--United States
Sierra Club
Sierra Nevada (Calif. and Nev.)
Princeton subject headings:
Conservation of natural resources--United States.
Mountaineering--United States.
Natural history--United States.
Sierra Club.
Sierra Nevada Mountains.