Uncertain path a search for the future of national parks /

Wedi'i Gadw mewn:

Manylion Llyfryddiaeth
Prif Awdur:	Tweed, William C.
Awdur Corfforaethol:	ebrary, Inc
Fformat:	Electronig eLyfr
Iaith:	Saesneg
Cyhoeddwyd:	Berkeley : University of California Press, c2010.
Pynciau:	Tweed, William C. > Travel > California. National parks and reserves > United States > Management. National parks and reserves > United States > Forecasting. National parks and reserves > United States > Philosophy. Nature conservation > United States. Environmental protection > United States. Wilderness areas > California. Yosemite National Park (Calif.) > Environmental condiitions. Kings Canyon National Park (Calif.) > Environmental condiitions. Sequoia National Park (Calif.) > Environmental condiitions. Electronic books.
Mynediad Ar-lein:	An electronic book accessible through the World Wide Web; click to view
Tagiau:	Ychwanegu Tag Dim Tagiau, Byddwch y cyntaf i dagio'r cofnod hwn!

Rhyngrwyd