I don't have the 12th Edition, but I've been buying the PPA since the late 70's, and they've stayed pretty much the same from edition to edition except for the updating of serial numbers for those companies that are still producing pianos. If you do a lot of appraising of newer pianos or want to find the exact year of manufacture for newer instruments, it's worth the investment. --David Nereson, RPT -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090428/aef6f7d3/attachment.html>
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