This set of three hardback books, titled "The World's Greatest Thinkers" and published by Random House in 1947, covers the topics of man, state, and spirit. The books are in their original English language and vintage edition, making them a unique addition to any collection. The set features the works of various philosophers and presents a nonfiction narrative on philosophy and expressionism. Each book is in good condition and is ex libris, but I will not discuss the condition further. This is a must-have for any philosophy enthusiast or collector.