National Park Service science in the 21st century :
a National Parks Science Committee report to the National Park System Advisory Board /
Sylvia A. Earle ... [et al.].

APA Citation

United States. National Park System Advisory Board., Earle, S. A., United States. National Parks Science Committee. (2009). National Park Service science in the 21st century: a National Parks Science Committee report to the National Park System Advisory Board. 2nd ed. Washington, DC: National Park System Advisory Board, U.S. Dept. of the Interior.

MLA Citation

United States. National Park System Advisory Board, Sylvia A. Earle, and United States. National Parks Science Committee. National Park Service Science In the 21st Century: a National Parks Science Committee Report to the National Park System Advisory Board. 2nd ed. Washington, DC: National Park System Advisory Board, U.S. Dept. of the Interior, 2009.