This database includes the health and life sciences portion of the Science Direct College Edition. About 1,000 peer-reviewed journals; hundreds of book series, handbooks and reference works; back to volume one, issue one.
Interdisciplinary database includes: Arts and Humanities Citation Index, Science Citation Index Expanded, and Social Sciences Citation Index. Includes citation searching (see how many times a paper has been cited). Coverage: 2000 - present.
Covers all aspects of human impact to the environment.
Michigan State University Libraries has published a great guide with a wealth of information on GIS Datasets- http://libguides.lib.msu.edu/gis
Please keep in mind that some of the resources listed on the MSU page may not be available to users outside of their university system.