Ah, the memories! In August 1981 we had a 3 day MK tkt, which included admission to River Country and Discovery Island (it was, maybe still is, a bird sanctuary on Bay Lake). The tks were paper and had a piece of string with a safety pin attached so guests could wear it if so desired - this was because multiday tkts for all attractions were new.
The price was so inexpensive, even for 1981 - I'll try to find it and post the cost. No scanner or would scan it as well. We pd $79 per ngt inc tx for the Contemporary Garden Wing (we were so excited to watch the monorail glide by every few minutes) and $105 plus tx for the Tower the summer of '82.
Those were the days...the entire 6 ngt trip, including air fare, CR, tkts and food was about $1200 for 1 adult/3 kids ages 7, 9 and 11...and we did the Hoop-Dee-Doo and Luau. Kids back then up to and including age 11. Disney even had a Jr tkt price (and meals) for ages 12-17.
August,1981:
adult 3 day tkt: $31.30 inc tx (3 day MK, 1 day River Country, 1 Discovery Island visit)
child (3-11) 3 day tkt: $23.75 inc tx
air: $119 per adult (the 11 yr old had an adult tkt so the others could go free)
2 children free