The "Complete Encyclopedia of Knives" by Tracy Tudor is a rare American guide focusing on pocket knives with a soft back design. The book, published by Tracy Tudor, covers a comprehensive range of knives and is written in English, making it a valuable resource for collectors and enthusiasts. With a focus on knives and authored by an expert in the field, this book offers in-depth information and insights into the world of pocket knives, making it a must-have for anyone interested in this unique category of knives.