Holden, Jeanne S. U.S. national parks: protecting nature and providing enjoyment/ Jeanne S. Holden. - Washington, D.C. : English Teaching Forum, c2006-2008. - v45 n4, pages 43-52; illustrations; 27 cm. ISSN: 1559-663X Subjects--Topical Terms: Parks--United States of America. Dewey Class. No.: DPer 420.705 En36 c2006-2008