North American Product Classification System (NAPCS) Canada 2012 Version 1.1
- 252 - Converted paper and paper products (except for packaging)
- 25211 - Paper office supplies
- 252111 - Envelopes
- 2521111 - Envelopes
- 252112 - Paper office supplies (except envelopes)
- 2521121 - Paper and paperboard office supplies
- 2521122 - Other stationery and unprinted office supplies
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