"In the fall of 1925, young Allan Odell conceived the idea of using consecutive signs along the roadside. . . . In 1963 the last signs were taken down, ending the most famous outdoor advertising venture ever."--1977 Minnesota Almanac
The whole story is in this book, plus all the jingles used. The signs are gone now, except for one set on permanent display at The Smithsonian. You can have them all, always, in your own library with this...