Preservation
- National Trust for Historic Preservation - http://www.nationaltrust.org
- Philadelphia Historical Commission - www.phila.gov/historical/
- Pennsylvania Historical and Museum Commission - www.phmc.state.pa.us
- Preservation Alliance of Greater Philadelphia - www.preservationalliance.com
- National Register of Historic Places - http://www.nationalregisterofhistoricplaces.com/
- City of Philadelphia Register of Historic Places - http://www.phila.gov/historical/register.html
- Preservation Directory - www.preservationdirectory.com
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