1. Seabed maps showing topography, ruggedness, backscatter intensity, sediment mobility, slope, and the distribution of geologic substrates in quadrangle 6 of the Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts Author/Creator: Valentine, Page C., cartographer Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2015 Resource Type: Map Access & Availability: Loading