Cornell University's resource for US preservationists includes listings of job opportunities and conferences, along with a directory of web-sites related to historic preservation.

Independent organization of friends and alumni of the Columbia University Historic Preservation Program.

A private consulting and research firm practicing preservation design, conditions assessments, materials science, and historic building documentation. Projects are in the northeastern United States

International organization dedicated to the collection, and restoration of historic military vehicles.

A group devoted to the preservation and promotion of Historic Route 66 in Illinois. Includes photographs and other information about sights along the route.