Straitsmouth Island Light
- Photo plus information on lighthouse located at the entrance to Rockport Harbor.
- http://www.ipl.org/div/light/ATL/Straitsmouth.html

Thacher Island Association
- Nonprofit organization for historic preservation and restoration of the structures on the island. Information on the lighthouses and wildlife on the island, with links to other lighthouse sites.
- http://www.thacherisland.org/

Cape Ann Lights
- Photo plus information on twin lights located on Thatcher Island, near Rockport, Massachusetts.
- http://www.cr.nps.gov/maritime/light/capeann.htm

Thacher Island Twin Lights
- History, photos plus descriptive information on the first lighthouses to be built to mark a dangerous spot rather than a harbor entrance.
- http://www.lighthouse.cc/thacher/index.html

Thacher Island Lights
- Description and color photo of both lights, with links to photos of the north tower and south tower.
- http://lighthousegetaway.com/lights/thatcher.html