Guarding the treasured lands:
the story of the National Park Service,
by Ann and Myron Sutton.

APA Citation

Sutton, A., Sutton, M. (1965). Guarding the treasured lands: the story of the National Park Service. [1st ed.] Philadelphia: Lippincott.

MLA Citation

Sutton, Ann, 1923-, and Myron Sutton. Guarding the Treasured Lands: the Story of the National Park Service. [1st ed.] Philadelphia: Lippincott, 1965.

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