| thearkandthedove.com | Society of the Ark and the Dove, The |
| mdhs.org | Maryland Historical Society |
| eapoe.org | E. A. Poe Society of Baltimore |
| daddezio.com | D'addezio.com - Maryland Historical Societies |
| arrowweb.com | The Maryland and Pennsylvania Railroad Preservation and Historical Society |
| preservemd.org | Preservation Maryland |
| nationaltrust.org | National Trust for Historic Preservation |
| montgomeryhistory.org | Montgomery County Historical Society |
| historiclondontown.com | Historic London Town & Gardens |
| nps.gov | National Register of Historic Places |
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