University of Florida
Fmnh: University of Florida Herbarium
This excellent site contains information on the University of Florida Herbarium located in Gainsville, Florida. The Herbarium offers five different collections of plants as well as an electronic library of plants.
Virginia Tech
Virginia Polytechnic Institute: Greenhouse Dinosaur Extinction Theory
This comprehensive page discusses the Asteroid Impact vs. Volcano-Greenhouse dinosaur extinction debate. It was written by paleontologist, professor, and scientist Dr. Dewey McLean.
Northern Arizona University
Land Use History of North America: Fossil Pollen (Palynology)
Use this site to learn why fossil pollen is a useful tool for determining paleoclimates.