- CollectionORC - Organizations Collection
- Série organiquePMA - Postmasters Association
- PièceIHM.2020.0018 - Addresses of Presidents and Secretaries of Postmasters Associations
- PièceIHM.2020.0361 - Saskatchewan Postmasters Association Conference Program 1925
- PièceIHM.2021.0474 - Canadian Postmasters Association convention