National parks for the future an appraisal of the national parks as they begin their second century in a changing America.
| निगमित लेखक: | |
|---|---|
| स्वरूप: | पुस्तक |
| भाषा: | English |
| प्रकाशित: |
Washington, D. C.
The Foundation
1972.
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| विषय: |