http://www.chance.psu.edu/modules/Invasive-plants/invasive-plant-species.html
http://www.invasivespeciescouncil.com/Profiles_Vascular.aspx
http://www.bhwp.org/resources/Invasive-Plants.htm
http://www.defenders.org/resources/publications/invasives/pennsylvania.pdf
http://www.bucksccd.org/cms/files/Invasives_ID2036.pdf
http://www.patrees.org/native-trees-vs-invasive-plants
http://www.eddmaps.org/tools/statereport.cfm?id=us_pa
http://www.dcnr.state.pa.us/forestry/invasivetutorial/List.htm
"All Access Pass"
http://www.envirothonpa.org/StationTraining.html
PLUS...go to www.quizlet.com and search mrsv211 for some helpful study sets :)