Digital collections

Tracing from the Reconnaisance of the Western Coast (Southern Sheet), showinglines of soundings to determine the 500 fathom curve. Run by the Hydrographicparty on board the U.S.C.S Stmt Hassler, under the command of Comdr P.C. Johnson U.S.N. Assist C.S. (Image credit: NARA C&GS; Colllection)