Your dad might want to try
Milsurpshooter.net as one website.
Gunboards.com is another good website to check out. Another thing to do is to do a
Google search for mauser rifles and visit the various websites that come up. A third thing is to check Google for Curio & Relic websites as there is a fair amount of information there.
One good book to have is Mauser Military Rifles of the World - 3rd edition by Robert Ball; check the various booksellers to see where you can get the best price.
Good Luck to you and your dad and welcome to the world of Mauser addiction
