1. Detailed hydrographic and topographic chart of the Itasca State Park : at the source of the Mississippi River, state of Minnesota, U.S.A. : prepared under authority of an act of the legislature, approved April 20th, 1891 Maps University Of Minnesota Public content 1892. Brower, J. V. (Jacob Vradenberg), 1844-1905. Relief shown by hachures. 75 x 40 centimeters Scale 1:21,120 Three inch to each statute mile General Map Collection. (United States).