Go to this site
http://www.hlebooks.com/ebook/liste01.htm
and look for the Luger mechanical, DWM, Luger Accessories. These are the 3 ebooks I have purchased. They will be down loaded to your computer and after you pay, you get a password to open them up. As I understand it, it is only valid on the computer it is loaded on. These are not hard cover books.