Back in the day instructograph had about 55 tapes listed as available with group numbers such as the basic 1 - 10, then RC-#, C-# etc...
Much later (maybe in the 1970s) they renumbered the tapes consecutively from 1 to 55....
I am trying to correlate the early list numbers to the more recent list numbers....
does anyone have a company list of those later number tapes? (The lists contain a brief description of the contents of the tape.)
Please email me direct at tom@lakeboon.com since I don't get on here that often. I will try to update this thread with info....

Thanks.