National Building Museum
- Website URL
- http://www.nbm.org/
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National Park Service - National Historic Landmarks Program
- Website URL
- http://www.nps.gov/nhl/
National Trust for Historic Preservation (Including the American Treasures Project)
- Website URL
- http://www.preservationnation.org/
Society of Architectural Historians
- Website URL
- http://www.sah.org/
University of Maryland Architecture Library (Also the National Trust for Historic Preservation Library)
- Website URL
- http://www.lib.umd.edu/architecture/
Urban Landscape Digital Image Access Project
- Website URL
- https://web.archive.org/web/20150912024842/http://library.duke.edu/digitalcollections/diap/