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Advisory Council on Historic Preservation Association for Preservation Technology International The Cultural Landscape Foundation Dumbarton Oaks – Garden and Landscape Studies Foundation for Landscape Studies The Garden Conservancy Historic American Landscape Survey (HALS) ICOMOS – Cultural Landscapes | Library of American Landscape History Living Landscape Observer National Association for Olmsted Parks (NAOP) National Association for Preservation Technology and Training National Trust for Canada National Trust for Heritage Preservation US National Park Service – Technical Preservation Services UNESCO World Hertiage Centre – Cultural Landscapes |
