North American Product Classification System (NAPCS) Canada 2017 Version 2.0
- 623 - Civil engineering works
- 62311 - Highways, roads, streets, bridges and tunnels
- 623111 - Highways, roads and streets
- 6231111 - Highways, roads and streets
- 623112 - Bridges
- 6231121 - Bridges
- 623113 - Tunnels
- 6231131 - Tunnels
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