by Esther Sarfatti
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Natural history · Summer
Journey into summer
1960
Square · Juvenile fiction
Square
2015
Bridges · Description and travel
Pochemu tak nazvany?
1962
Shapes · Shape
I see squares
2010
Vocabulary · Juvenile literature
Silly shapes
1997
Formes quadratiques · Quadratic Forms
Squares
1993
Geographical Names · Names, Geographical
1967
Juvenile Nonfiction · Square
Four sides the same
2005
Shapes · Juvenile literature
Squares and triangles
Square · Juvenile literature
square
Advanced Arithmetic
1910
Triangle · Geometry
The wing on a flea
1961
Triangle · Juvenile fiction
Triangle
Triangle · Juvenile literature
Stone age geometry
2014
Computer-assisted instruction · Geometer's Sketchpad
Shape makers
1998
Shop mathematics · Triangle
Solution of triangles
1921
Juvenile Nonfiction · Triangle
Party of three
Shapes · Triangle
Triangles
2007