O'Brien, B. R. (1999). Our national parks and the search for sustainability / Bob R. O'Brien ; drawings by Gary O'Brien: Bob R. O'Brien ; drawings by Gary O'Brien. Austin: University of Texas Press.
Chicago Style CitationO'Brien, Bob R. Our National Parks and the Search for Sustainability / Bob R. O'Brien ; Drawings By Gary O'Brien: Bob R. O'Brien ; Drawings By Gary O'Brien. Austin: University of Texas Press, 1999.
MLA CitationO'Brien, Bob R. Our National Parks and the Search for Sustainability / Bob R. O'Brien ; Drawings By Gary O'Brien: Bob R. O'Brien ; Drawings By Gary O'Brien. Austin: University of Texas Press, 1999.
Warning: These citations may not always be 100% accurate.
