The Military Megapack
Stephen Crane & Ambrose Bierce & Philip K. Dick & Harry Harrison & Arthur J. Burks
Stillness Is the Key
Ryan Holiday
The Leopard Hunts In Darkness
Wilbur Smith
Primal Fear
William Diehl
Martin Vail (1)
How to Calculate Quickly: Full Course in Speed Arithmetic
Henry Sticker
Speed Mathematics Simplified
Edward Stoddard
The Trachtenberg Speed System of Basic Mathematics
Jakow Trachtenberg
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