2.
Mathematics and Science An Adventure in Postage Stamps
by Schaaf, William L.
ISBN: 9780873531221
List Price: $9.00
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Course for Teachers of Junior High School Mathematics
by Schaaf, William L.
ISBN: 9780404553135
List Price: $37.50
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Bibliography of Recreational Mathematics
by Schaaf, William L.
ISBN: 9780873530217
List Price: $10.00
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Bibliography of Recreational Mathematics
by Schaaf, William L.
ISBN: 9780873530231
List Price: $5.00
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Bibliography of Recreational Mathematics
by Schaaf, William L.
ISBN: 9780873530224
List Price: $6.00