This page details a specific electronic resource that has been indicated by Villanova Librarians as useful in conducting research.
U.S. Gov't agencies- USGS (U.S. Geoological Survey)
The USGS lists its mission as "providing reliable scientific information to describe and understand the Earth; minimize loss of life and property from natural disasters; manage water, biological, energy, and mineral resources; and enhance and protect our quality of life." Also contains historical topographic maps.
Geography and the Environment