The product is a first edition paperback book titled "Not By The Book" by Eric McAllister Smith. Published in 1968 during the 1960s, this nonfiction narrative is intended for an adult audience and focuses on military history. The book delves into the history and military tactics of the Vietnam War, specifically within the I Corps Military Intelligence unit. With a dust jacket included, this compelling read offers a unique perspective on this tumultuous era in American history. A few pages have been underlined in ink.