Collecting puzzle books is the most interesting hobby I can think of. It beats collecting old Buddy Greco records and it sure licks stamps. I wish I could say it's the fastest growing pastime in America, but it isn't. In truth, I doubt there are more than a dozen of us in the field. What a shame there aren't more.
Shortz, William F.
"How to Collect Puzzle Books,"
Word Ways: Vol. 11
, Article 9.
Available at: http://digitalcommons.butler.edu/wordways/vol11/iss3/9