Keep it, Cindy! I think it's a very cool souvenir. And how big can it be?
I have a Magic Kingdom park map from July 1972, the first time we visited it. It was in a bag containing a bunch of travel brochures from that trip.
There are brochures for places like Cypress Gardens and Silver Springs. I collected them at rest-stops on the ride down to Florida. At 9 years old, I was already a little info-maniac for travel attractions.