State-of-the-art (for the time!) 1962 map of Mars, based on observations by Lowell Observatory’s Earl Slipher & Percival Lowell, & UT Austin’s Gerard de Vaucoleurs - this was the map available informing the first Mars flyby by NASA JPL’s Mariner 4 in 1965.
collectionslowellobservatory.omeka.net/exhibits/show/…