At first glance, this seems to be another in the series of black-and-white brochures issued by the Northern Pacific in the late 1930s, such as the ones for Portland, the Rockies, and Rivers. But this one is smaller and doesn’t use red ink for highlighting.
Click image to download a 2.6-MB PDF of this brochure.
Pacific Steamship Company, which operated from 1916 to 1936. So it is clear this brochure came out before many of the ones with red highlighting, but not clear how much before.
The only hint about the date of this brochure is a mention of theAs an aside, the brochure calls Ketchikan “the first city of Alaska.” Wikipedia implies that this is because it is the “earliest extant incorporated city in Alaska.” But, when this brochure was issued, Skagway was incorporated before Ketchikan. (It was later reincorporated, which is what Wikipedia means by “extant.”) The term “first city” comes from the fact that it was the first Alaskan city reached by travelers taking steamboats from Seattle or Vancouver.