Restricted World War II Aviation Map
Detailed aeronautical map of the Yellowstone region.
The chart is a font of information about civil and military aviation during WWII. It was intended for civil aviators flying by visual navigation and so includes data that would be useful for this purpose.
Topographical information consists of relief and a judicious selection of visual checkpoints used for navigation under visual flight rules. The checkpoints include populated places, roads, and distinct landmarks. The aeronautical information includes visual and radio aids to navigation, airports (aerodromes, both for landplanes and seaplanes), controlled airspace, restricted areas, and obstructions.
Sectional Aeronautical Charts were updated somewhat frequently at this time and are now produced by the FAA.
The military information is probably the most interesting aspect of the chart.