Preliminary sketch showing the positions of Davis's South Shoal and other dangers recently discovered by the Coast Survey and the soundings on the Old South Shoal, Bass Rip, Old Man, Pochinck Rip, &c.
Depths shown by soundings and shading. At head of title: (A no. 3). Includes bearings, distances, shoals, tides, and bottom types. Historic Maps copy has extensive ms. annotations in pen. Historic Maps copy has note on verso: Received April 15th, '51.