The "Dictionary of Marks: Pottery and Porcelain" is a comprehensive guide authored by Ralph M. Kovel and Terry H. Kovel, published in 1978. This book serves as a valuable resource for collectors and enthusiasts of pottery and porcelain, providing detailed information on various marks and signatures found on these types of items. With a focus on pottery as the main topic, this book offers a wealth of knowledge in English language for those interested in identifying and learning more about different pieces of pottery and porcelain from around the world.