I'll use any source for info when I need it quick and/or to use on a job:CD,internet or whatever,but for my leisure use I always want a book and am willing to pay the price for the right book. I have never regretted the thousands of dollars I have invested in my library. I buy about 3-5 books a month on the average on many subjects and have for years. Getting hard to find ones I don't have on some subjects as I am into books to use and not just look at. I would be willing to put some money up front for what Mr. Petrov has in mind to publish. We simply cannot afford to lose what material he has found in his research and it should be easily available for future collectors and shooters to look at.