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Maybe
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Dead Reckoning: Calculating Without Instruments
Ronald W. Doerfler
The MacGuffin
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Rapid Math: Tricks and Tips: 30 Days to Number Mastery
Edward H. Julius
More Rapid Math: Tricks and Tips: 30 Days to Number Mastery
How to Calculate Quickly: Full Course in Speed Arithmetic
Henry Sticker
Speed Mathematics Simplified
Edward Stoddard
Short-Cut Math
Gerard W. Kelly
The Trachtenberg Speed System of Basic Mathematics
Jakow Trachtenberg