Preliminary coast chart No. 70, Florida reefs from Long Key to Newfound Harbor Key / from a trigonometrical survey under the direction of A.D. Bache, Superintendent of the survey of the coast of the United States ; traingulation by J.E. Hilgard, Lietus. A.H. Seward, J.C. Clark, U.S.A. Assts. J. Rockwell and J.A. Sullivan, Sub-Assts ; topography by I.Hull Adams, Asst., C.T. Jardella and F.W. Dorr, Sub-Assistants ; hydrography by the parties under the command of Lieuts. Comdg. T.A. Craven, W.G. Temple and J. Wilkinson U.S.N. Assists

One of four sheets covering the Florida keys ; Depths shown by shading and soundings ; Includes sheet index, text and tables ; "No. 16" -- upper left margin ; Map complete in 4 sheets: No. 68, Florida reefs from Key Biscayne to Carysfort Reef (1861) -- No. 69, Florida reefs from the Elbow to Lower Matecumbe Key (1863) -- No. 70, Florida reefs from Long Key to Newfound Harbor Key (1863) -- No. 71, Florida reefs from Newfound Harbor Key to Boca Grande Key (1862)Grayscale1:80,00