IXL Learning
The IXL Ultimate 4th Grade Math Workbook, Activity Book for Kids Ages 9-10 Covering Addition, Subtraction, Multiplication, Division, Fractions, ... and More Mathematics (IXL Ultimate Workbooks)
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QuickStudy
Geometry Part 2 QuickStudy Laminated Reference Guide (QuickStudy Academic)
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For Dummies
Geometry For Dummies
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Minireference Co.
No bullshit guide to linear algebra
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Basic Books
The Magic of Math: Solving for x and Figuring Out Why
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For Dummies
Geometry Workbook For Dummies (For Dummies: Learning Made Easy)
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Ishi Press
How To Solve It: A New Aspect of Mathematical Method
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Independently published
Isometric Graph Paper: Simple Isometric Graph Paper Notebook - 110 Pages (8.5" x 11" Inches)
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QuickStudy
Geometric Formulas QuickStudy Laminated Reference Guide (Quick Study Academic)
R 474
Bloomsbury
Sacred Geometry (Wooden Books, 35)
R 476