Anyone remember a magazine ad from International sometime in the mid '70s which showed a landscape from above with red tractors all over the place?   Disking, chopping silage, haying, etc.   I think it was artwork, I believe it was two pages, and I think would have been 66 series tractors.  Sort of looked matchbox sized.  For some reason I really liked it at the time...when I was in college I did a fair amount of research in the periodicals microfiche from that era and never happened across it.   I have lots of magazines from the '80s but only a few pages older then that.