1998 - Combining and Comparing Addition and Subtration [Investigations in number, data and space] (Other) ISBN-13: 9781572327009 ISBN-10: 1572327006 Genres: Nonfiction, Engineering & Transportation ? 1994 - Combining and Comparing Addition and Subtraction [Investigations in Number, Data, and Space] (Paperback) ISBN-13: 9780866518055 ISBN-10: 0866518053 Genre: Science & Math 1 1990 - Used Numbers Statistics Middles Means and Inbetween (Paperback) ISBN-13: 9780866515184 ISBN-10: 0866515186 Genre: Nonfiction 2 Beyond Drill and Practice Expanding the Computer Mainstream (Paperback) ISBN-13: 9780865861909 ISBN-10: 0865861900 ? |