My favorite part of this (yes, this ad has remained open for…7 hours now in one of the 11 screens I have going), is the order of things.
It’s not alphabetical.
It’s not by length (sometimes when I setting things up in columns I would sort things by text string length because sometimes I need things to look a certain way).
It’s not by difficulty.
It’s not exactly an arts and sciences partition, in as much as things of varying degrees of immediate potential utility are all mixed together.
In my primary hypothesis, DR gathered together JR, SR, maybe others (though maybe not, this isn’t necessarily a level of interest diversity that is infeasible in even one person, let alone 3), maybe a secretary type, and it was something like a white-boarding (or, given the era, chalk-boarding) session of “What do you want to learn about? Just shout it out, we’ll write them all down.”
“…Breakfast in a Hurry.”
“We already have that.”
“I know: I’m hungry.”
“How many do we have?”
“Alright, we have enough folders for that. Print it.”