  1988 - Discovering Mathematics Book 2 Teacher's Guide Investigations and Projects (Paperback) ISBN-13: 9780333459393 ISBN-10: 0333459393 ?  1987 - Discovering Mathematics Bk 1 Investigations and Projects (Paperback) ISBN-13: 9780333422953 ISBN-10: 0333422953 ?  1986 - Think It Out Bk 1 Problemsolving Exercises in Mathematics (Paperback) ISBN-13: 9780713184075 ISBN-10: 0713184078 ?  1986 - Think It Out Bk 2 Problemsolving Exercises in Mathematics (Paperback) ISBN-13: 9780713184082 ISBN-10: 0713184086 ?  |
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