Bache, A. D. (Alexander Dallas),  and United States Coast Survey.  "Preliminary sketch showing the positions of Davis' 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.."  Map.  1853.  Norman B. Leventhal Map & Education Center,  https://collections.leventhalmap.org/search/commonwealth:hq37vv92f (accessed April 08, 2020).