This paperback book, titled "Mission Earth 7, Voyage Of Vengeance" by L. Ron Hubbard, was published in 1987. It is written in English and falls under the category of Books & Magazines. The book is a great addition for anyone interested in the author's work, as it contains important aspects such as the publication year and type of the book. The title is clearly visible and the author's name is mentioned in the book. This book is a must-have for anyone who wants to explore the author's writings and is in a paperback format for easy reading.