There are a lot listed in the Communications of the ACM journals. Taking a random May 1967.....NCR 315 family, SDS (Sigma 7,5), Burroughs 500, Univac 1108...at least to get an idea of what systems look like so you can hunt down the terminal/vector/display types. Don't forget plotters and terminal printers. What percent used these as the primary display? Or is that not what you want? Bill