The University of Guelph here in Ontario was formerly the Ontario Agricultural College and apparently back in the day they started keeping a copy of ag related advertisements.
Their archives department at the library lets you view these collections, you can't check them out like books but I did convince them to let me scan them.
There is 25 boxes crammed with IH brochures, sales bulletins, catalogues, probably somewhere around 20 000 pages of stuff, just roughly guessing by the fact that it took me 3 hours to get through the first half of the first box. The box I looked at was tractors, hundred series through 04/06 series, and I wasn't able to skim through every box but theres stuff on tractors back to pre letter series up to 66 series where it seems to get a bit more spotty, there's multiple boxes on trucks, many boxes on implements, there's some construction stuff, stationary engines, combines, cream seperators & fridges... you get the idea.
I know the literature doesn't turn everyone's crank but to me this was quite the find. Not sure how much of it I will find the time to scan but it doesn't seem like they have any intention of getting rid of any of it... i asked.
Quite a few of the smaller ads 2 pagers/4 pagers are "International Harvester of Canada". Not sure if the actual publication differed at all from the US version or maybe they just changed "who" it was from.
The biggest oddity I came across so far was a 2 page ad for a 404 Lo-Boy , didn't know those existed but a google search brought a few up. I would imagine this ad for them hasn't been seen by many so thought I would share.
I'm not sure when i'll have a chance to go look at some more but I'll extend the offer to you guys on here, if there's an ad you'd like to have a digital copy of, send me a PM and eventually if i come across it i'll scan it. Can't guarantee they have it all, as I said it seems to get spotty after 56 series stuff, but there sure is a lot. They've got all this stuff hiding in the basement, probably barely ever sees the light of day so it might as well be shared to the people who will appreciate it.