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Heritage Preservation Association (HPA)
http://www.hpa.org/
National Trust for Historic Preservation
http://www.nationaltrust.org/
National Center for Preservation Technology and Training
http://www.ncptt.nps.gov/
promotes the preservation of prehistoric and historic resources through its research, technology, training, and grants programs
Heritage Conservation and Historic Preservation
http://home.vicnet.net.au/~conserv/hp-hc.htm
This site, from the Preservation and Storage Division of the State Library of Victoria, offers a range of resources for anyone interested in the care of heritage material, sites and structures.
National Trust Library of the University of Maryland
http://www.lib.umd.edu/NTL/ntl.html
Preservation Alliance of Minnesota
http://www.tc.umn.edu/~brook024/pam.htm
Conservation OnLine: WWW
http://palimpsest.stanford.edu/
International Council on Monuments and Sites (ICOMOS)
http://www.icomos.org/
National Park Service
http://www.nps.gov/
Canadian: CultureNet
http://www.ffa.ucalgary.ca/