Perseus Digital Library (Tufts University) Description: Perseus is an evolving digital library, engineering interactions through time, space, and language. More Info Express Link for Perseus Digital Library (Tufts University) × Express Link Copy
National Centers for Environmental Information (NGDC) Description: The NGDC provides scientific stewardship, products, and services for geophysical data from the Sun to the Earth and Earth's sea floor and solid earth environment, including Earth observations from space. More Info Express Link for National Centers for Environmental Information (NGDC) × Express Link Copy
PTSDpubs (formerly titled PILOTS: Published International Literature On Traumatic Stress) Description: Worldwide literature on mental-health consequences of exposure to traumatic events. More Info Express Link for PTSDpubs (formerly titled PILOTS: Published International Literature On Traumatic Stress) × Express Link Copy
Directory of Published Conference Proceedings (DoPP) Description: Index to published proceedings in a wide variety of subject areas. More Info Express Link for Directory of Published Conference Proceedings (DoPP) × Express Link Copy
Homeland Security Digital Library (HSDL) Description: Materials for homeland security research More Info Express Link for Homeland Security Digital Library (HSDL) × Express Link Copy
