Click a region above. The window below will show an image map for the region (taken from the National Resources Canada Topographic Index). You can then click on a more specific area within the region, and the next window below will show this area. The title will relate to that area's map at a scale of 1:250,000. Clicking within the 2nd window will show you the map titles within the area at a scale of 1:50,000 (Each square represents 1 map).