Treasure of the Mayan King
Alex Zabala & Dyego Alehandro
Let's Hear It for the Deaf Man
Ed McBain
The Tenth Commandment
Lawrence Sanders
The Commandment (10)
The Killing Habit
Mark Billingham
Tom Thorne (15)
Dead Reckoning: Calculating Without Instruments
Ronald W. Doerfler
How to Calculate Quickly: Full Course in Speed Arithmetic
Henry Sticker
More Rapid Math: Tricks and Tips: 30 Days to Number Mastery
Edward H. Julius
Rapid Math: Tricks and Tips: 30 Days to Number Mastery
Short-Cut Math
Gerard W. Kelly
Speed Mathematics Simplified
Edward Stoddard
The Trachtenberg Speed System of Basic Mathematics
Jakow Trachtenberg