By Robert S. Block

With the help of more than 700 beautiful color photos, this book gives values for machine-made marbles from the early 1900s to the 1930s. Get a look at bricks, cobras, guineas, opaques, slags, and more. The book also presents a brief history of the two key Ohio marble makers, M.F. Christensen & Son Company and Christensen Agate Company.

159 Pages; Hardcover

Published in 2003 by Schiffer Publishing Ltd.