I have been going through all the ESRI Map Books that I have collected over the years from the ESRI user conferences. In the 1991 map book, actually titled “Arc/Info Maps 1991”, I came across a map made by Los Angeles County titled “Cities and Major Features in Los Angeles County”. Maybe used Arc/Info 5 or 6? Looks like they used an electrostatic plotter that printed the map in 4 passes for cyan, magenta, yellow, and black. Awesome!