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.
Letter to Siddiqui, M. G. 22 August 1966 MacAllister, J.B.. Letter to Siddiqui, M. G. 22 August 1966 In MacAllister’s Visit to Dacca Aug 66 II. University of Pennsylvania and Pennsylvania Historical and Museum Commission, Louis I. Kahn Collection, Box LIK, 1966.
Neil Thompson, letter to Henry Wilcots, 17 October 1968 Neil Thompson, letter to Henry Wilcots, 17 October 1968 In Pac Correspondence To/Fr Gus, Jun 1968 thru Dec. 31, 1968. University of Pennsylvania and Pennsylvania Historical and Museum Commission, Kahn Collection, Box LIK 117. Philadelphia (USA), 1968.
Henry Wilcots to David Wisdom, letter of 8 June 1967 "Henry Wilcots to David Wisdom, letter of 8 June 1967." In PAC – Correspondence to/from Gus, Hune 1967 thru Dec 1967, 117. University of Pennsylvania and Pennsylvania Historical and Museum Commission, Louis I. Kahn Collection, Box LIK 117. Philadelphia (USA), 1967.