Featured in this lot is this 1931 Great Northern Railway advertisement calendar pair. There are two calendars in this collection from 1931. The first is of a female Native American woman that reads, "America's Scenic Adventureland Glacier National Park Route of the Empire Builder and the Oriental Limited." The second is of an older Native American man and the advertisement reads, “Electrified through the Cascades via America's Longest Tunnel Route of the Empire Builder.” The condition of these calendars is good for their age. The measurements of these calendars are 22 1/4" x 10".