From 1959 through 1964, Great Northern issued at least 22 of these brochures that fold up to be slightly smaller than a postcard. With this one for Spokane, the only one I know I am missing is for Hawaii.
Click image to download a 1.6-MB PDF of this brochure.
Except for one for the generic “East,” meaning east of Chicago, all the ones I have are for Glacier Park or points west of there. It seems reasonable that the Twin Cities, Winnipeg, or upstate Minnesota would deserve their own brochures, but I’ve never seen any sign of them.