Note (7/31/2008) - We've started adding 1:50K scale topographic maps of Canada, starting with British Columbia. The Canadian topographic map coverage is still a bit experimental, and integration into the map viewer still needs a little work. The map viewer will not yet automatically select the 1:50K scale topographic maps, so if you're trying to view maps in Canada, you may need to manually switch to the 1:50K Topo Maps selection in the Map Contents section of the sidebar.