*Gontz, A.M., Belknap, D.F., and Kelley, J.T., 2002, Seafloor features and characteristics of the Black Ledges area, Penobscot Bay, Maine, USA. Journal of Coastal Research, Special Issue 36, p. 333-339.

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Hooke, R. LeB., and Jennings, C., 2006, On the formation of tunnel valleys: Quaternary Science Reviews, v. 25(11-12), p. 1364-1372.