Marple, R. T., and J. D. Hurd. “LiDAR and Other Evidence for the Southwest Continuation and Late Quaternary Reactivation of the Norumbega Fault System and a Cross-Cutting Structure Near Biddeford, Maine, USA”. Atlantic Geoscience, vol. 55, Oct. 2019, pp. 323-59, doi:10.4138/atlgeol.2019.011.