Observer's Book of Aircraft

In the past, I think there is a book that is indispensable for every lover aviation …. Do you expect? Well, it is a book for the specialist aviation author, Mr. William Green The observer’s book of aircraft, but it is regrettable that the book is no longer being issued. Some may differ with me, but the book remains useful to know the specifications of the types of aircraft and other important information and simple as well. I do not know is there a book can now be compared to what he gave us this book invaluable benefit from important information and the small size that one can carry in his pocket wherever he goes?! and the low price. My question is what is your opinion of this book is there an alternative book for? Whether one can get from a simple one book to the information required on the specifications of aircraft and other or through the Internet ?!