Know Your Cat's Purr Points: A Practical Guide for the Purr Point Practitioner
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Furst published in 2000, the P.A. actually bought a copy in 2003, so it's been in the library fur quite a while and while totally tongue-in-cheek, this is a furry funny book and, the P.A. actually did try some of the purr points with great success.
It's highly entertaining and I would suggest reading it on a wet afturnoon when mew have your hooman with mew, so mew can direct your hooman in this ancient art.
Mew won't be disappointed, I wasn't! MOL