Michigan is the most popularly collected state for official road maps. It is easy to understand why when you see all the beautifully artistic covers. This 1957 map it the second to last issued before the Mackinaw Bridge was completed. It features the Point Betsie Lighthouse, near Frankfort, which looks much the same today as it did back then.
Michigan Official maps are a fun and challenging collection to assemble. They are also great contemporary items to go with your classic automobile. I have one in the glove box of my ’65 Mustang!