The Golden Book Encyclopedia is a set of children's encyclopedias published by Western Printing and Lithographing Company under the name Golden Press. Advertised with circulars in newspapers, the encyclopedias were sent out in weekly or bi-weekly installments. Supermarket chains, such as Acme Markets, used these encyclopedias as a promotional hook to lure shoppers. The front page of every volume describes the books as, "Fact-filled Volumes Dramatically Illustrated with More Than 6,000 Pictures. The Only Encyclopedia for Young Grade-school children. Accurate and Authoritative. Entertainingly written and illustrated to make learning an adventure." Subjects covered in the series included nature, science, history, geography, literature, and the arts. Source: Wikipedia (en)