- CollectionORC - Organizations Collection
- SeriesPMA - Postmasters Association
- ItemIHM.2020.0018 - Addresses of Presidents and Secretaries of Postmasters Associations
- ItemIHM.2020.0361 - Saskatchewan Postmasters Association Conference Program 1925(draft)
- ItemIHM.2021.0474 - Canadian Postmasters Association convention
- ItemIHM.2023.0095 - Saskatchewan Postmasters convention