Advisory Council on Historic Preservation
The Advisory Council on Historic Preservation is an independent federal agency created by the National Historic Preservation Act of 1966 (NHPA), and is the major policy advisor to the Government in the field of historic preservation.

National Center for Preservation Technology and Training
NCPTT promotes and enhances the preservation and conservation of prehistoric and historic resources in the United States for present and future generations through the advancement and dissemination of preservation technology and training.

Historic Amercian Buildings Survey
Historic Amercian Engineering Record
Historic Amercian Landscapes Survey
Administered since 1933 through cooperative agreements with the National Park Service, the Library of Congress, and the private sector, ongoing programs of the National Park Service have recorded America's built environment in multiformat surveys comprising more than 556,900 measured drawings, large-format photographs, and written histories for more than 38,600 historic structures and sites dating from Pre-Columbian times to the twentieth century. This online presentation of the HABS/HAER/HALS collections includes digitized images of measured drawings, black-and-white photographs, color transparencies, photo captions, written history pages, and supplemental materials.

National Register of Historic Places
The National Register is the Nation's official list of cultural resources worthy of preservation. Properties listed on the Register include districts, sites, buildings, structures, and objects that are significant in American history, architecture, archeology, engineering, and culture.