The listed coordinates will take you to the old Missoula Public Library building. The cache is a short walk from here. You will need to complete the Missoula Public Library Tour Adventure Lab to receive information to solve for the correct coordinates.
https://adventurelab.page.link/Nx6z
N 46 A.B W C D.E
The cache only has room for the log, so bring something to sign the log. Please replace as found.
NOTE: Make sure to sign the cache logbook, as online "Found It" logs without a corresponding entry in the logbook will be deleted.