from survey made between the 14th & 27th August 1856 by assistant John R. Mayer, under the direction of Brevet Lieut. Col. J.D. Graham, Major, U.S. Top. Engineers. Superintending Engineer of Lake Michigan Works
from survey made in October 1856 by assistant John R. Mayer 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 March 29th & April 9th 1856 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 10th & 15th of Sepbr. 1856 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 17th of August & the 2nd of September 1858 under the direction of Brevet Lieut. Col. J.D. Graham, Major U.S. Top. Engineers. Superintending Engineer of Lake Harbor 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