Dictionary of Earth Sciences (Oxford Reference Online) - Oxford Online has dictionaries covering a wide range of topics including this handy dictionary of earth sciences.
Dictionary of Ecology (Oxford Reference Online) - Oxford Online has dictionaries covering a wide range of topics including this handy dictionary of ecology.
Dictionary of Environment and Conservation (Oxford Reference Online) - Oxford Online has dictionaries covering a wide range of topics including this handy dictionary of environmental and conservation issues.
Dictionary of Geography (Oxford Reference Online) - Oxford Online contains entries on all aspects of both human and physical geography.
Encyclopedia of Geography (Sage Reference Online) - The six volume set cover geography's long, rich, and fascinating history, including human geography, physical geography, and GIS. Provides succinct summarizes of trends such as globalization, environmental destruction, new geospatial technologies, and cyberspace.
Oxford Companion to Global Change (Oxford Reference Online) - this is an up-to-date, comprehensive, interdisciplinary guide to the range of issues surrounding natural and human-induced changes in the Earth's environment.
Oxford Companion to the Earth (Oxford Reference Online) - this Oxford reference book contains many entries relating to earth's geography and geology.
