Issue No.09 - September (1975 vol.8)
D.A. Michalopoulos , California State University
A new optical mark reader system that checks and grades test papers at the rate of 7000 answer sheets an hour has been introduced by National Computer Systems of Minneapolis.
D.A. Michalopoulos, "New Products", Computer, vol.8, no. 9, pp. 58-63, September 1975, doi:10.1109/C-M.1975.219077