Nonlocal Variable = Envelope/documentation.

I've had to wait a long time for documentation to turn up in the past but astonished by 26 year wait for "The Bicycle Book" by nonlocal variable (USA) that turned up yesterday. Sadly some of the people in it have long gone but a few names include John Held, Roger Stevens (aka rADIO) Leslie Caldera, Magda Lagerwerf and yours truly to name but a few.