How long ago were the studies made? One thing that's changed since then is the disappearance of continous form printing. Decades ago, you could print a 250

How long ago were the studies made? One thing that's changed since then is the disappearance of continous form printing. Decades ago, you could print a 250 line function on four connected pages and lay them down on a table and see the entire function. Nowadays, reading printouts like that is unheard of.