A Deadly Row
Casey Mayes
The Sanctuary Sparrow
Ellis Peters
Brother Cadfael (7)
Filling in the Cracks
Thomas Larson
The Event Series (4)
Night Victims (The Night Spider)
John Lutz
Dead Reckoning: Calculating Without Instruments
Ronald W. Doerfler
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
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