S1963-1964 #82: Mesa Verde National Park/H. Douglas Osborne (May 6, 1964–September 1, 1964), S1987-1988 #32: California State University, East Bay (February 1988–August 2, 1988), and S1990-1991 #28: Mesa Verde National Park (March 12, 1991–June 10, 1994)