Marbles Identification and Price Guide Author:Robert Block Revised and expanded, here again is the fascinating world of marbles. Indians, Aggies, Steelies, and more...every major category of marble is presented in this new and exciting guide. Included are old handmade marbles of glass, earthenware, minerals, and steel; machine-made marbles and their manufacturers; and contemporary handmade glass marbles... more » by artisans recapturing the old styles and creating exciting new styles all their own. Marble pricing is explained in detail. The author describes the four factors to look for when determining the value of a marble, and presents an accurate guide to today's market.« less