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Web Links Links for Students Crane Study http://www.geocities.com/wccwg/Research/ptt_study.htm University of Minnesota Raptor Center http://www.raptor.cvm.umn.edu/ www.peregrinefund.org/world.html Photo Period Calculator http://aa.usno.navy.mil/data International Center for the Study of Bird Migration's , Migrating Birds Know No Boundaries (www.birds.org.il). Links for Teachers
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