History:

Ask a historian
Http://www.cr.nps.gov/history/ask.htm

Pittsburgh history and landmark foundation
http://www.phlf.com/

bridging the urban landscape
http://www.carnegielibrary.org/exhibit/

teaching with historic places
http://www.cr.nps.gov/nr/twhp/

national historic landmarks
http://www.cr.nps.gov/nhl/index.htm

Architect Information:

Architecture History and Historic Preservation
http://brie1.library.cmu.edu:8089/library/originaldesignbySubject/architecture/archhist.html

American Institute of Architects
www.aiaonline.com

Society of Architectural Historians
www.sah.org

Archeology:

National Parks service archeology and ethnography programs
http://www.cr.nps.gov/aad/index.htm

Archeology technical briefs
http://www.cr.nps.gov/aad/aepubs.html

America’s hidden battlefields
http://ww2.cr.nps.gov/abpp/hidden/hidden.htm

Historic Buildings:

Learn to identify characteristics of historic buildings
http://www.2.cr.nps.gov/tps/walkthrough/index.htm

The boilerplate “yess”
http://www.2.cr.nps.gov/tps/yess/index.htm

The boilerplate “nos”
http://www.2.cr.nps.gov/gov/tps/boilerplate/index.htm

A checklist for rehabilitating historic buildings
http://www.2.cr.nps.gov/tps/cheklist.htm