World Desertification Bibliography A joint project of UNEP (United Nations Environment Programme) and the OALS (University of Arizona's Office of Arid Land Studies), this Bibliography contains 3,897 citations of relevant information on decertification control for decision-makers, planners, researchers and scientists. Researchers worldwide contributed to this edition by collecting evidence on the nature and causes of environmental changes constituting an extension of deserts into marginal areas or an intensification of desert conditions within arid regions. Book Ordering Information:    Sales Number: E. 95.III.D.70     ISBN: 92-1-127017-0     Pages: 294pp.      Price: $40.00 [Environment Main] [Subject Index] [Alphabetical Index] [UN Publications Policies] Copyright © 1997 United Nations