The national parks;
what they mean to you and me.
With a preface by Conrad L. Wirth.

APA Citation

Tilden, F. (1961). The national parks: what they mean to you and me. [Rev. ed.] New York: Knopf.

MLA Citation

Tilden, Freeman, 1883-. The National Parks: What They Mean to You And Me. [Rev. ed.] New York: Knopf, 1961.

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