Mike, this is from memory, so bear with me.
Towards the end, although not specifically 1971, the Adirondack handled coal to the stream plant at Raybrook, LPG (propane) to Saranac and Lake Placid, and finished lumber to Thendara, and Saranac and/or Placid (maybe both--I don't recall.) We did some rare work at JC (Tupper Lake Junction) too, but no recollection today what it was. Oval Wood Dish maybe, but ... maybe not.
I'm pretty sure by the end all the less car load was gone, and it seems backwards to haul lumber into the Adirondacks but we did. I don't remember any loads of anything coming out on the Adirondack side.
You didn't ask about the St. Lawrence side, but we took coal to the steam plant at Marcy, lumber and LPG to Holland Patent, LPG, lumber and feed to Boonville, and empty cars to the mill in Lyons Falls. Paper loads came out of Lyons Falls. The mill generated switching work, even when there were no cars in or out.
The Lake Placid Job didn't handle any work south of Remsen North ("SNOW" on Conrail and MA&N) because the Lyons Falls Job ran with five or six time the frequency.
Todd