The refurbished Thomas J. Lee monument in New Albin, Iowa, seen looking northwesterly into Minnesota. The monument, originally erected by Lee and the U.S. Topographic Engineer Corps in 1849, marks the Minnesota–Iowa boundary near Minnesota's southeast corner. Photographed by William Lass on November 3, 2009.
Map showing three Minnesota–Wisconsin boundaries proposed during the late 1840s. Created by Alan Ominsky and reproduced in Lass, William E., "Minnesota's Separation from Wisconsin," Minnesota History 50 (Winter 1987): 311.