I will confess that this isn't a thrift-store find, but I did buy it secondhand at Half Price Books recently.
I had discovered that T.S. Eliot had written a cat poem about naming a cat. I've always enjoyed his poetry, especially "The Love Song of J. Alfred Prufrock."
I had no idea he'd written a book of cat poems!
The illustrations are done by Edward Gorey, and are fantastic! I will enjoy reading this. This version is dated 1982, and if you can find a copy, you will certainly enjoy it too.