Database that covers journals, books, books, conference proceedings, and reports for geography, geology, and ecology...

Contains "about 160 academic articles covering the salient aspects of soil physics, chemistry, biology, fertility, technology, genesis, morphology, classification and geomorphology...

Online mapping system, based on Google Maps, but adding a layer of USGS topographic maps as well as an "as the crow flies" mileage calculator...

System that allows access to free downloads (or purchase of paper copies) of topographic maps from the United States Geological Survey...

Interactive map of the United States, which provides a large number of optional layers for customized viewing and downloading...

An gateway site that focuses physical geography, a sub-discipline of two much larger fields of study: Geography and Earth Sciences...

"This set covers all important water science concepts and current issues and highlights major historical developments and key figures...