Little Mark Island Monument Harpswell, Maine
- 1. National Register Feature: Little Mark Island Monument (archived). National Register of Historic Places. National Parks Service, 2016.
- 2. Cebula, Tim. Harpswell lighthouse among latest beacons U.S. government is giving away. www.pressherald.com. 2023. "Town officials say they plan to discuss taking ownership of Little Mark Island Monument."
- 3. Pratt, Mark. Always wanted a lighthouse? US is giving some away, selling others at auction. apnews.com. 2023.
