You may receive a postcard mailer from the Association National office that looks like the photo here. I've received calls and seen quite a few posts asking if this is legit -- it is.
This is another go-around by National to 1) get your updated contact info under the pretext of a "member directory", and 2) raise some funds off the sale of the hard copy book. They did the same thing a few years back.
It doesn't cost anything to submit your contact and service info for inclusion in the book; only purchasing the book costs money, and that's optional. Just know that last time the book took quite a bit longer than expected to complete.
AATW!