A charming set of 4 children's books, published to teach children about natural resources and our capitalistic system. Each book is approx. 24pgs. and have very nice color artwork covers that are repeated on the back covers. Also all four are well illustrated with many b&w photographs. All of the books are in fine near fine condition with the exception of Coal which has a very faint not noticeable crease to the back cover. Sold as a collection only.