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structure
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Columbia
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Canada
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1. Canada Aqueducts, Canals, Flumes and Penstocks, 2007
2007. International Steering Committee for Global Mapping (ISCGM). Canada Aqueducts, Canals, Flumes and Penstocks is a line theme representing those inland water features in Canada. This layer is a component of t...
2. Canada Tunnels and Bridges, 2007
2007. International Steering Committee for Global Mapping (ISCGM). Canada Tunnels and Bridges is a line theme representing tunnels and bridges in Canada. This layer is a component of the Global Map, a 1:1,000,00...