::Also, for what it's worth, the high-res topo maps of Canada (NRCan made) appear to still be available online via "mytopo.com", this link  should show the MT-SK-NWT "tripoint" marked with a survey monument symbol and the numbers "157". There are no topo maps at this scale just to the east, including where the NU-NWT boundary is shown on smaller scale ("lower res") topo maps. I'm not sure why that is. The topo cutoff is marked "District of Mackenzie", a pre-Nunavut name whose boundary was along 102°00'W, although never surveyed on the ground.