Pittsburgh tunnels and bridges
http://www.pghbridges.com/

Pittsburgh skyscrapers
http://www.skyscraperpicture.com/pittsburgh.htm

Pittsburgh community development corp
http://www.city-net.com/friendship-pgh/cdc/pgh_cdc.html

Pittsburgh historic museums http://www.carnegielibrary.org/subject/history/museums.html

Pittsburgh History & Landmarks Foundation
http://www.phlf.org/

10,000 Friends of Pennsylvania
http://www.10000friends.org

Advisory Council on Historic Preservation
http://www.achp.gov/

City of Pittsburgh Historic Review Commission
http://www.city.pittsburgh.pa.us/cp/html/historic_review_commission.html

Community Design Center of Pittsburgh
http://www.cdcp.org/

National Register of Historic Places (National Park Service)
http://www.cr.nps.gov/nr/

National Trust for Historic Preservation
http://www.nthp.org

Partners for Sacred Places
http://www.sacredplaces.org/

Pennsylvania Historical & Museum Commission
http://www.phmc.state.pa.us/

Pennsylvania Historic Tax Credit Legislation
http://www.pataxcredit.com/

Pittsburgh Cultural Trust
http://www.pgharts.org/

Pittsburgh Downtown Partnership
http://www.downtownpittsburgh.com/

Pittsburgh Regional History Center
http://www.pghhistory.org/

Preservation Action
http://www.preservationaction.org/

Preservation Pennsylvania
http://www.preservationpa.org/FrameHome.htm

Rivers of Steel
http://www.riversofsteel.com/

Sustainable Pittsburgh
http://www.sustainablepittsburgh.org/

Technical Preservation Services (National Park Service)
http://www2.cr.nps.gov/tps/care/goodguides.htm

Young Preservationists Association
http://www.youngpreservationists.org