Baerg, Harry J. How to know western trees - 2 ed - Dubuque, Iowa : Brown, 1973 - 179 p. ; - The pictured key nature series . - The pictured key nature series . LCCN: 10320 Subjects--Topical Terms: Árboles.Árboles--E.U.A. Dewey Class. No.: 634.97 / B34 1973