The Earth Unit Study Book No. 660

American Education Press. Columbus, Ohio Condition: Good+. (Copyright 1939 by The Educational Printing House, Inc., but the inside rear cover lists this book as an American Education Press publication.) Unit Study Book No. 660. Softcover. 32 pages profusely illustrated (with photos & drawings). Ex-library copy with appropriate mark stamped on front cover and last text page. Contents are clean and bright. Early version is somewhat scarce.

(Prior to WWII, The Educational Printing House, Inc. of Columbus, Ohio printed short, small paperback pamphlet books in the Unit Study Book series. The originals were often reprinted by The American Education Press, Inc. of Columbus, Ohio through 1940. The authors of the Unit Study Book series books were elementary school educators and frequent contributors of the My Weekly Reader, a popular children's periodical also published by the American Education Press, Inc. in Columbus, Ohio. After WWII, the Unit Study Book Series became the Little Wonder Series published by the Charles E. Merrill Publishing Company of Columbus, Ohio and New York, New York. The Little Wonder books were marketed as a collection of the small booklets and marketed in a metal, hinged box as a library of 50 booklets. The original Unit Study Books are scarce.)