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- Annual report [elektronický zdroj] / Conservation. . [Winnipeg] : Manitoba Conservation, [2000]- . v.
- National parks [elektronický zdroj] . . [Washington, D.C. : The National Parks& Conservation Association, c1980- . v.
- National wildlife [elektronický zdroj] . . [Washington, D.C.] : National Wildlife Federation, 1963-[2005] . v.
- Worldwatch paper [elektronický zdroj] . . Washington, D.C. : Worldwatch Institute, 1975-2006. . 172 v.