Contains files for a clinic, conferences, congresses, a seminar, meetings, and workshops. Contents include notes, programs, manuscripts, lists of participants, ephemera, newsletters, correspondence, graphs, and charts.

Rahn attended annual International Congresses held by the International Union of Physiological Sciences. Folders are labeled with the chronological roman numeral of the congress. The Union also sponsored satellite symposia concurrent or close to their congresses. Specific symposia may be found in Subseries B. Symposia, but available planning records are found here as they relate to multiple symposia.

Includes phonograph of Respiration-Suite composed by Jurriaan Audriessen for Wallace Fenn, premiered at the XXII International Congress.