Palo Alto Battlefield :
the Battle of Palo Alto and the Mexican-American War.

APA Citation

United States. National Park Service. (1994). Palo Alto Battlefield: the Battle of Palo Alto and the Mexican-American War. [Washington, D.C.?] : National Park Service, U.S. Dept. of the Interior.

MLA Citation

United States. National Park Service. Palo Alto Battlefield: the Battle of Palo Alto And the Mexican-American War. [Washington, D.C.?] : National Park Service, U.S. Dept. of the Interior, 1994.

Warning: These citations may not always be complete (especially for serials).