The World Book Encyclopedia Dictionary-Complete 2 Volume Set 1979 Hardcovers A-Z is a collector's edition encyclopedia dictionary that covers a wide range of topics including geography, mathematics & sciences, environment, nature & earth, engineering & technology, adventure, ecology, animals & pets, history, and historical events. This set is a vintage piece that is perfect for adults who seek knowledge from different parts of the world. The encyclopedia is written in English and is published by Thorndyke Barnhart. It features illustrations and is intended for an audience who seeks to learn more about the world around them. With 2 units available, this set is a great addition to any collection.