Fatal Flaw
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Victor Carl (3)
Mourn the Living
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Hard Rain
Barry Eisler
John Rain (2)
Cooking in Season
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How to Calculate Quickly: Full Course in Speed Arithmetic
Henry Sticker
Speed Mathematics Simplified
Edward Stoddard
The Trachtenberg Speed System of Basic Mathematics
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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
Dead Reckoning: Calculating Without Instruments
Ronald W. Doerfler
Short-Cut Math
Gerard W. Kelly