"Identification cards were issued by police to some 2,000 persons working or living in the tornado area by Saturday night. A group clusters around the traffic bureau desk in the police department. The cards are issued only to persons authorized to be in the area, said Chief of Police J. Walter Olson." - caption with image, published in the Fargo Forum, June 23, 1957, p. 8.
North Dakota State University, Institute for Regional Studies, Cal Olson Photograph Collection, 2098