The world's greatest military spies and secret service agents. This book, "The world's greatest military spies and secret service agents. Volume 1", by George Barton, is a replication of a book originally published before 1917. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.