As a representative of the younger generation, I must pipe up that I love Pogo too! Got the bug (and copies of the books) from my mom, who read them when she was a child -- such skill, and joy and humor!

As for the claims about most of the books being out of print -- there are active efforts afoot to get *all* the strips back in print, and there were reprints as recently as the 90s, from Fantographics. See the Wikipedia entry for details.