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The Adventures of Rubi Pi and the Aviation Girls: History of Flight in Stories - Paperback 
The Adventures of Rubi Pi and the Aviation Girls: History of Flight in Stories - Paperback
The Adventures of Rubi Pi and the Aviation Girls: History of Flight in Stories - Paperback
By Tom Durwood
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The Adventures of Ruby Pi and the Geometry Girls: Teen Heroines in History Use Geometry, Algebra, and Other Mathematics to Solve Colossal Problems - Paperback 
The Adventures of Ruby Pi and the Geometry Girls: Teen Heroines in History Use Geometry, Algebra, and Other Mathematics to Solve Colossal Problems - Paperback
The Adventures of Ruby Pi and the Geometry Girls: Teen Heroines in History Use Geometry, Algebra, and Other Mathematics to Solve Colossal Problems - Paperback
By Tom Durwood
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The Adventures of Ruby Pi and the Math Girls: Teen Heroines in History Use Geometry, Algebra, and Other Mathematics to Solve Colossal Problems - Paperback 
The Adventures of Ruby Pi and the Math Girls: Teen Heroines in History Use Geometry, Algebra, and Other Mathematics to Solve Colossal Problems - Paperback
The Adventures of Ruby Pi and the Math Girls: Teen Heroines in History Use Geometry, Algebra, and Other Mathematics to Solve Colossal Problems - Paperback
By Tom Durwood
