- UC26 : Notre Dame Class of 1926 and pre-1924 Alumni Secretary: Records - CLOSED.
- AC26 : Notre Dame Class of 1926 and pre-1924 Alumni Secretary: Audio-Visual Material
- AC26 32134 CD : WQCS FM 88.9 with Janie Gould - Interview with I.I. Probst - Notre Dame's Oldest Living Grad 2007/0423
- AC26 32233 DVD : Slide Show of I.I. Probst photographs 2007
- GC26 : Notre Dame Class of 1926 and pre-1924 Alumni Secretary: Graphics
- GC26 1/01 Color Print : Alumnus I. I. Probst (Class of 1926) at the age of 102; photo by Sparky 2007/03