This is a rare and valuable 10-volume set of Collier's New Encyclopedia, published in 1921 by P. F. Collier & Sons in New York. The hardcover books feature raised letters on the covers and are beautifully illustrated with special attributes that make them a unique addition to any collection. The encyclopedia covers a wide range of topics and is written in English, making it a great reference tool for collectors and enthusiasts alike. The books are in their original form and were printed in the United States, adding to their historical value. This set is a must-have for anyone who loves reference books and wants to add a piece of history to their collection.