19-3-2 Alter Project (Alternative Living Technology and Energy Research) and Planetkeepers, 1982 - 1996, bulk: 1982 - 1986. College of Health, Environment and Science Records, RG-019. Slippery Rock University Archives and Special Collections. http://as-slippery.klnpa.org/repositories/2/archival_objects/350 Accessed December 11, 2023.