Edit to clarify... submitted too late...

Since it's on John Byrne's own gallery page, it may not have ever been published - he usually only posts unpublished work or stuff from art books and magazines:
http://www.artofjohnbyrne.com/gallery/sketches/sketch-marvel/sketch-xmen/Wolviecolor.jpg.php

My best guess would be, if it HAS been published, it's in a magazine somewhere...

Mike Hansen, The Geekiary & All Day Comics
Last Edited By: psykomyko Oct 1 13 3:20 PM. Edited 2 times.