There is a card file on MN photographers in the Weyerhaueser Library at the MN History Center. It provides dates, locations, business genealogy (who sold the business to whom and its new name, etc.), and other notes. Not on-line -- but could be helpful if you are trying to locate what happened to the records or negatives of a photographer. Mary Mary Bakeman mbakeman@parkbooks.com Park Genealogical Books http://www.parkbooks.com