Activity guide for organized groups :
Rock Creek Nature Center.

APA Citation

United States. National Park Service. National Capital Region. (1984). Activity guide for organized groups: Rock Creek Nature Center. [Washington, D.C.]: [U.S. Dept. of the Interior, National Park Service, National Capital Region, Rock Creek Nature Center].

MLA Citation

United States. National Park Service. National Capital Region. Activity Guide for Organized Groups: Rock Creek Nature Center. [Washington, D.C.]: [U.S. Dept. of the Interior, National Park Service, National Capital Region, Rock Creek Nature Center], 1984.