Henry Bosse was hired by the Army Corps of Engineers to photograph the Upper Mississippi River at the turn of the century. His photographs of the Mississippi from St. Anthony Falls to Grafton, Ilinois show the transformation of the river from an untamed wilderness to the busy commercial corridor of the industrial era. Bosse printed his river photos using iron salts to produce a misty blue image. The photos were first displayed at the 1893 World's Fair in Chicago. Because they were government property the army sold copies for a mere 40 cents. Today the prints are worth twenty-five thousand dollars. University of St. Thomas Journalism professor Mark Neuzil has compiled Bosse's photos in "Views on the Mississippi: The Photographs of Henry Peter Bosse."