- CollectieORC - Organizations Collection
- ReeksPMA - Postmasters Association
- StukIHM.2020.0018 - Addresses of Presidents and Secretaries of Postmasters Associations
- StukIHM.2020.0361 - Saskatchewan Postmasters Association Conference Program 1925
- StukIHM.2021.0474 - Canadian Postmasters Association convention