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!
SoCalGIS.org 
Very cool.
Cool map. We made many similar maps with electrostatic plotters (until around 2001). One small thing; they didn’t notice that they missed the City of Santa Clarita (incorporated in 1987). But cool, nonetheless.
Hey, I made that map, thank you for the post. btw, the map was made before the Santa Clarita incorporation. Leigh
I have a newer version (1992) with updated boundaries.
Very cool! -mike