1. Head of Green Bay, including Fox River below Depere, Wisconsin Maps University Of Minnesota Public content 1912. U.S. Lake Survey. Relief shown by contours. Depths shown by gradient tints and soundings.; "Issued February 7, 1912." 82 x 60 centimeters Scale 1:25,000 General Map ... On sale at U.S. Lake Survey Office (Detroit, Mich).