1.
Trachtenberg Speed System of Basic Mathematics System of Basic Math
by Cutler, Ann, McShane, Rudolph
ISBN: 9780313232008
List Price: $87.95
2.
Trachtenberg Speed System of Basic Mathematics
by Trachtenberg, Jakow, Cutler...
ISBN: 9784871877091
List Price: $25.95
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The Trachtenberg Speed System of Basic Mathematics
by JAKOW translated and adapte...
ISBN: 9781127438310
List Price: $17.33