- The description on the back of this sheet was written by François E. Matthes, who was a geologist and surveyor who studied the unique, remote areas of the Western United States from 1895 until his death in 1948.
- Like modern day folded brochures and trinkets, I believe that these map sheets were originally distributed and/ or sold to visitors of Crater Lake National Park in the 1930s. I have many of these sheets that were never distributed.
- The map on this sheet shows the original 1911 Crater Lake Nat'l Park topographic survey. On top of this survey in red is the 1931 survey by the BPR (Bureau of Public Works) of the roads in the park prior to road improvements.
- This map would be an awesome item for anyone who loves Crater Lake and would make a great addition to any wall! I would recommend some type of 28" x 20" dual-sided pressed glass flip frame so that both sides could be viewed.