Books by Douglas Brumbaugh
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Scratch Your Brain Where It Itches C1: Math Games, Tricks & Quick Activities
Author(s): Douglas Brumbaugh
ISBN-13: 9780894555244
Publisher: Critical Thinking Books & Soft
Format: Paperback, 42 pages
Scratch Your Brain Where It Itches E1-Geometry: Math Games, Tricks & Quick Activ
Author(s): Douglas Brumbaugh
ISBN-13: 9780894555268