Maria Langford for Roy Vollmer, letter to David Wisdom, 30 June 1965
Maria Langford for Roy Vollmer, letter to David Wisdom, 30 June 1965 In Pac Cap – Correspondence to/from Roy/Gus, Oct. 8. 1964 thru June 30, 1965. University of Pennsylvania and Pennsylvania Historical and Museum Commission, Louis I. Kahn Collection, Box LIK 117. Philadelphia (USA), 1965.