This 1977 vintage paperback book titled "The Calvus Files Secret Agent Enterprise" by Martin M. Bartel is a must-have for any fan of spy fiction. The book was published in the 70s and features a thrilling story about secret agents. Written in English, it is a great addition to your collection of books and magazines.It is a fanzine magazine published by Martin and is perfect for anyone who loves to read about agents and spy missions. Don't miss the opportunity to add this book to your collection.