The state historical society has digitized it archives releasing thousands of historic photos, manuscripts and government records. Click on the URL to visit the site http://sddigitalarchives.contentdm.oclc.org/cdm
A search of Mitchell yeilds 76 results ranging from exterior shots of The Corn Palace to a handwritten letter from Charles A Schweppe about the Capital Fight.
There is really some fascinating stuff on the site for both history and photo buffs.
