Listed below are a few of the reference resources available for viewing. Click on the title link to access the e-book content.
Blackwell's Concise Encyclopedia of Ecology by 
Blackwell's Concise Encyclopedia of Environmental Management by 
Encyclopedia of Ecology and Environmental Management by 
Habitats and Ecosystems : an encyclopedia of endangered America by
Includes an overview of endangered ecosystems; state-by-state roster of threatened sites; a discussion of the controversial question of what is endangered and what isn't; appendixes listing important state and federal agencies and endangered and threatened species.
McGraw-Hill Dictionary of Environmental Science
Oxford Companion to the Earth by
"How old is the Earth? Is it really likely to be hit by a meteorite? What can Antarctic ice cores and Milankovich cycles tell us about global warming? What is a Milankovich cycle anyway? Where would you find black smokers? Are they ever likely to be useful? What causes tornadoes? Should you worry if you live near a transform plate boundary? What is the difference between a tidal wave and a tsunami? Does it matter? Can rocks affect your health?"
"Answers to these and many similar questions will be found in the Oxford Companion to the Earth. The aim of the Companion is to provide concise and readable accounts of the main phenomena and processes relating to the Earth. Like the other Oxford Companions, it is aimed at a wide readership, and will appeal both to professional Earth scientists seeking an accessible digest of topics outside their own areas of specialization, as well as to the general reader looking for an approachable reference book on our planet and the environment. For all these readers, and many more, the Companion will not only provide a valuable source of reference but also fascinating and informative browsing."
"The scope of the Companion is wide: it is concerned with the entire planetary environment on which all living things (ourselves included) depend: the atmosphere and the oceans as well as the solid Earth. And since we can no longer consider the Earth in isolation, information about other parts of the Solar System also finds a place here."--Jacket.
The Princeton Guide to Ecology by