Visit the following websites:
The Penn State Sailplane Class
http://www.psu.edu/dept/aerospace/sailplane/index.html

The Pennsylvania Bureau of Topographic and Geologic Survey
http://www.dcnr.state.pa.us/topogeo/

Hawk Mountain Sanctuary
http://www.hawkmountain.org/default.shtml

USGS - Patuxent Wildlife Research Center
http://www.mbr-pwrc.usgs.gov

National Soaring Museum
http://www.soaringmuseum.org

Soaring Society of America
http://www.ssa.org