Ebook: Communication Systems

Beware the paperback version of this book. I don't know if all sellers are doing this but the seller I purchased from (The Book Depository) sent me the "international version" which apparently has somewhat different content than the "North American" version. Even worse, the back cover of the text explicitly states that this version should not be sold in North America. As I purchased this through the Amazon web site, I hold Amazon at least partially responsible.