books.google.com - Selections from the Encyclopedia of Environmental Issues. These volumes target specific subject areas within the general topic of environmental issues and make selections from the main work available as affordable monographs, classroom material, and circulating reference....http://books.google.com/books/about/Ecology_Ecosystems.html?id=vLEDywAACAAJ&utm_source=gb-gplus-shareEcology & Ecosystems
Salem Press, Incorporated, 2011 - Science - 152 pages
Selections from the Encyclopedia of Environmental Issues. These volumes target specific subject areas within the general topic of environmental issues and make selections from the main work available as affordable monographs, classroom material, and circulating reference.
