Devilbiss Perfume Bottles: 1907 to 1968 by Marti DeGraaf & Toby Mack (Authors). The book was several years in the making and has over 900 photos which include items from several major collections as well as the authors. It also contains info from never before seen Devilbiss Company archives. We were lucky to be in a group that got a sneak peek of part of the book's contents. A wonderful and informative book for any Devilbiss collector!
The most extensive online resource I have found for silver marks for major world countrys as well as some of their famous makers. Great site for when your reference books are not with you or a country you do not have a book for in your personal library.