These are card decks containing source and object code. I was learning to program and these were mostly just exercises in creating various types of files and retrieving them. My programming wasn't much better than my spelling. The "20" on some decks indicated that it was for the 360/20 rather than a "regular" 360. The model 20 instruction set was pretty much a subset of the other machines with some special variations thrown in to handle the 16 bit (instead of 32 bit) registers, etc.