2008 - The Abacus Discover the Genius in Your Child (Paperback) ISBN-13: 9788189738341 ISBN-10: 8189738348 Genre: Science & Math ? 2008 - The Abacus the Worlds First Computing System Where It Comes From How It Worksand How to Use Itto Perform Matematical Feats Great and Small (Other) ISBN-13: 9781435280847 ISBN-10: 1435280849 ? 1995 - The Abacus the World's First Computer System [Includes a Working Abacus] (Paperback) ISBN-13: 9780312104092 ISBN-10: 031210409X Genre: Science & Math 3 The Abacus a Pocket Computer (Paperback) ISBN-13: 9780312001407 ISBN-10: 0312001401 Genre: Science & Math ? |