I just stitched together all the maps from the 1923 Sanborn map collection. Anyone want to give input on which is std, narrow, and dual? If people can make suggestions, I can color code the lines and repost the image. I chose to start at the shop facilities but will move further north as I get information. BTW, I'd post the whole thing but it's 2Mb in size (7000x4000 pixels).