Frank Duff, Manager of Logistics for the Psychedelic Rangers, Otis Spann Memorial Field, circa 1972 Year c.1972 Rights Held By Bruce Fulton and Andrea Fulton-Higgins Copyright Copyright Protected Free Concerts in the Park Doug Fulton Exhibit Photo Subjects Ann Arbor Parks Rock Concerts in the Park Psychedelic Rangers Free Concerts in the Park Doug Fulton Exhibit Frank Duff Doug Fulton Huron High School Otis Spann Memorial Field