ICOMOS (International Council of Monuments and Sites): Colloque de Caceres, Spain, March 1967: published proceedings of the "First Conference on the Conservation, Restoration and Revival of Areas and Groups of Buildings of Historic Interest," "The Future of Historic Centers in the Americas," by Carl Feiss, correspondence., 1967, Box: 17, Folder: 5. Carl Feiss papers, 2635. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/370184 Accessed March 31, 2026.