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OpenStax: US History
Author(s):
"U.S. History is designed to meet the scope and sequence requirements of most introductory courses. The text provides a balanced approach to U.S. history, considering the people, events, and ideas that have shaped the United States from both the top down (politics, economics, diplomacy) and bottom u...
Woody Plants in North America
Author(s): John R Seiler, Edward C Jensen, John Peterson
Woody Plants in North America is an interactive multimedia identification tutorial for woody plants found throughout North America. The software was developed over a 15-year period at Virginia Tech in cooperation with tree identification experts at Oregon State University, The Pennsylvania State Uni...