1878. Wyld, James, 1812-1887. Indexed.; Maps printed in one tone; cover in two tones.; Included on Iowa side advertisement and inset: Trunk highway map of Minneapolis and St. Pa... J. Wyld (London).
1947. Schultz, Kenneth A. This polygon shapefile represents areas that were the subject of interstate territorial disputes between 1947 and 2000. The disputed areas referenc... Stanford Digital Repository.