The book is OK. it mainly covers striking varieties with some die varieties. ie. it lists Strike doubling, die cracks among other things. it does show and list some die varieties though. But the best way to describe this book is that it is great for the beginer, although I would recommend the Cherry Pickers guide or Ken Potters web site to learn the difference between strike doubling anf true doubled dies. I myself am a variety collector. And there are and have been better books published. As for foriegn (non- US coins for the sake of arguement), I am currently working on photographing well over 600, if not more, doubled dies, repunched dates (mintmarks), various varieties, etc. My only issue on that is trying to find the right software that has what I need. ie. proper spacing / sections to put variety info, which die number, etc and be able to sort by such features and allows the inclusion of more than just 2 pics. Whew.....Long post, sorry, and seems like I got a lil off track.
Good Luck & Keep Searchin'
dacoinman