North American Product Classification System (NAPCS) Canada [Provisional Version 0.1]
- 512 - Internet, software and other computer related services
- 519011 - Internet publishing and broadcasting services
- 519011.21 - Textbooks, online
- 519011.21.1 - Elementary and secondary school textbooks, online
- 519011.21.2 - Postsecondary textbooks, online
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