Showing the Harbors of Refuge in their vicinity being an extract from the Survey of the West End of Lake Erie made under the direction of the Bureau of Topographical Engineers, War Department in obedience to Acts of Congress requiring the Survey of the Northern and North Western Lakes. Triangulation by Lieut. J.N. Macomb Corps Top. Engrs. Hydrography & Topography by Lieuts. Macomb, Woodruff, Gunnison, Scammon & W.F. Smith, Corps Topl. Engrs. and Messrs Burgess, Peter and Forster, Assistants under the orders of Lieut. Col. Kearney, Corps Top Engrs. 1849