Approaches to Cohasset Harbor Mass. : topography surveyed in 1847 ; hydrography surveyed in 1846-'56. Manuscript tracing in ink of an unpublished Coast Survey chart. Relief shown by contours, hachures and spot heights. Depths shown by soundings and isolines. Includes notes. At head of title: Coast Survey, Bache , Massachusetts , Norfolk ,county , Cohasset

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