These books, attractively illustrated throughout in four colors, provide lively and interesting reading for both classroom and individual use. Vocabulary and structures are graded, following the scheme developed by L. A. Hill, and the readers are grouped in four stages at the 500, 750, 1000, and 1500 headword levels. Each stage contains two levels of interest, Junior and Senior, to give a variety of content and to appeal to readers of different ages. A glossary and comprehension and vocabulary questions are at the back of each book.