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Prime Witness
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Madriani (2)
Ratf**ked
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Border War
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The Trachtenberg Speed System of Basic Mathematics
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Dead Reckoning: Calculating Without Instruments
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Short-Cut Math
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Speed Mathematics Simplified
Edward Stoddard
How to Calculate Quickly: Full Course in Speed Arithmetic
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More Rapid Math: Tricks and Tips: 30 Days to Number Mastery
Edward H. Julius
Rapid Math: Tricks and Tips: 30 Days to Number Mastery