Greetings, I am a new member of the forums and I was currently looking for the book by Oleg D. Jefimenko titled 'gravitation and co-gravitation' without having to deal with amazon. As a current member of I found his book on electricity and magnetism, just not a digital download .pdf of gravitation and cogravitation. If theres anyone who has a digital copy or knows where to send me to a website; that would be greatly appreciated.