I had an Indian longbow in '56 or '57. You may have seen it pictured with the kid with the Butch wax hair style, in the Old Duffers Thread.
Just last weekend my wife was cleaning up and handed me, "A Handbook of Archer," by Indian Archery & Toy Corp. ; Evansville, Indiana.
I'm sort of a Year of the Rat kind of guy and saved the original booklet that came with my bow. It was marked, '5 cent ea.'
Yours was probably used for college archery, PE classes. (just a guess)
Mine wasn't that model.
In the booklet they recommend a 8" long piece of white wood, holding it out at arms length and make marks for your different Points of Aim.
They recommended closing the left eye, and sighting with the right eye, bring the pile of the arrow to the point of aim.
I remember that I got frustrated with that Point of Aim stuff in a few minutes, and just started shooting by looking. Enjoyed the latter for the last 50 years or so.
Yeah, Evansville, Indiana. Did I wander, sorry.