...A booklet, "Le Damas", written by Mr, Jean Puraye, Curator of the Liege Museum of Arms and published by them is your best source of information on damascus barrel manufacture. [Unfortunately written in Flemish.] If you have access to the American Rifleman, April 1976, an authorised, [shortened by 1/3] , version of Mr Purayes booklet is to be found on pages 25-28.
I loaned my copy to Abby at Cornell Publishing. She has the reprint of "Le Damas" for sale. I get nothing from this. Just thought it good to get it out there. Keep hoping that some one who is fluent will get ambitious and translate it...

Here are scans of the '76 article:
http://s27.photobucket.com/albums/c181/tintype1/LeDamas/I have tracked down a salesman's piece from Liege that has pictures of 20 various damascus types to choose from. IF I can get it, I will scan it and post a link here.
Pete