"Woody PLANTS of UTAH: a field guide to native and NATURALIZED trees, shrubs, cacti, and vines". USU Press, Logan, UT 520 pp. 

 - . 1998. "Natural History of the Colorado PLATEAU and GREAT Basin". Ed. UNIVERSITY PRESS of Colorado, 294 pp. ISBN 0870815113, ISBN 9780870815119

 - . 1983. "Influence of TREE Overstory on Understory Production and Composition in Aspen Forests of Central Utah". Ed. Brigham Young Univ. DEPT. of Botany and Range Sci. 54 pp. 
 Honores. 
 Membresías. 
 - Academia Nacional de Ciencias de Estados UNIDOS
 - ASOCIACIÓN Estadounidense para EL Avance de la Ciencia
 Galardones.
"Woody plants of Utah: a field guide to native and naturalized trees, shrubs, cacti, and vines". USU Press, Logan, UT 520 pp. 

 - . 1998. "Natural History of the Colorado Plateau and Great Basin". Ed. University Press of Colorado, 294 pp. ISBN 0870815113, ISBN 9780870815119

 - . 1983. "Influence of Tree Overstory on Understory Production and Composition in Aspen Forests of Central Utah". Ed. Brigham Young Univ. Dept. of Botany and Range Sci. 54 pp. 
 Honores. 
 Membresías. 
 - Academia Nacional de Ciencias de Estados Unidos
 - Asociación Estadounidense para el Avance de la Ciencia
 Galardones.
uppercase
wikipedia