Jakow Trachtenberg
Jakow Trachtenberg (17/06/1888 Odessa Ukraine to ??/??/1953 Zürich Switzerland)
   
Trachtenberg Speed System of Basic Mathematics Trachtenberg Speed System of Basic Mathematics
PAN MP86 from 1965
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Trachtenberg Speed System of Basic Mathematics Trachtenberg Speed System of Basic Mathematics
PAN MP86 from 1968
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Trachtenberg Speed System of Basic Mathematics Trachtenberg Speed System of Basic Mathematics
PAN 0330 230897 from 1973
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