from survey made between the 14th & 19th of August 1856 by assistant John O'Donoghue, under the direction of Brevet Lieut. Col. J.D. Graham, Major, U.S. Top. Engineers, superintending engineer of Lake Michigan Works
from survey made between the 19th & 24th of August 1856, by assistant John O'Donoghue under the directionof Brevet Lieut. Col. J.D. Graham, Major, U.S. Corps of Topographical Engineers. Superintending Engineer of Lake Michigan Works