Walt Disney World and Sesame Street are about the same age, just two year apart in fact. Anyone my age or younger that grew up watching Sesame Street has got to remember the numbers sequences (the “one of these things doesn’t belong” sequences were my favorite) so lets relive those fond memories and do some numbering!
The 11 adventure books are super rare, this one from October 1971 is the cover only. Here's the back showing Walt Disney World's Opening day attractions. (link)