Columbia subject headings:
Camping--California, Northern.
Camping--Sierra Nevada (Calif. and Nev.)
Johnson, Robert P. (Robert Paul), 1957-
Harvard subject headings:
Camping--California, Northern.
Camping--Sierra Nevada (Calif. and Nev.)
Johnson, Robert P. (Robert Paul), 1957-
Princeton subject headings:
Camping--Sierra Nevada (Calif. and Nev.).