SHOWTIME - Visualization of plant movement following the last glaciation

SITESEER - Summary Pollen Diagram Database

REGIONAL SURVEY OF NORTH AMERICAN VEGETATION HISTORY

Alaska

Pacific Northwest and California

Colorado and Wyoming

Texas and Mississippi

Minnesota and Iowa

Illinois and Missouri

Ohio and Pennsylvania

Maine and Massachusetts

New York and New Jersey

Georgia and Florida

North America Paleovegetation Maps

Digital Representations of Tree Species Range Maps from "Atlas of United States Trees" by Elbert L. Little.

USDA Plant data base (for scientific and common names)
Glossary of paleobotany and palynology
LRC Handbook: pollen preparation
University of Arizona 
Pollen data bases
American Association of Stratigraphic Palynologists 
Canadian Association of Palynologists
USGS Pollen and Spores

Biome2 model