File U of M Extension Orchestra In: David E. Mattern papers, 1905-1972 (majority within 1930-1959) » Professional Career
File Programs, 1945-1959 Box 4 In: David E. Mattern papers, 1905-1972 (majority within 1930-1959) » Professional Career » U of M Extension Orchestra
File Participants' Letters Box 4 In: David E. Mattern papers, 1905-1972 (majority within 1930-1959) » Professional Career » U of M Extension Orchestra
File Business and Miscellaneous Box 4 In: David E. Mattern papers, 1905-1972 (majority within 1930-1959) » Professional Career » U of M Extension Orchestra
File Clippings and Publicity Box 4 In: David E. Mattern papers, 1905-1972 (majority within 1930-1959) » Professional Career » U of M Extension Orchestra
File U of M "Under and Over Sixty Club", 1956 Box 4 In: David E. Mattern papers, 1905-1972 (majority within 1930-1959) » Professional Career
File U of M Summer Sessions In: David E. Mattern papers, 1905-1972 (majority within 1930-1959) » Professional Career
File 1936, 1939, 1947-1949 Box 4 In: David E. Mattern papers, 1905-1972 (majority within 1930-1959) » Professional Career » U of M Summer Sessions
File 1950 Box 4 In: David E. Mattern papers, 1905-1972 (majority within 1930-1959) » Professional Career » U of M Summer Sessions
File 1951-1952 Box 4 In: David E. Mattern papers, 1905-1972 (majority within 1930-1959) » Professional Career » U of M Summer Sessions