Bibliography of Wells, Robert V., by subject:

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•	United States -- Population -- History (4)
•	Size (3)
•	Size judgment -- Juvenile literature (3)
•	Time measurements -- Juvenile literature (2)
•	Body size -- Juvenile literature (2)
•	Atoms -- Juvenile literature (2)
•	Nuclear size (Physics) -- Juvenile literature (2)
•	Speed -- Juvenile literature (2)
•	Amazon.com -- Children's Books -- Ages 9-12 -- General (2)
•	Speed (2)
•	Size perception -- Juvenile literature (2)
•	Science -- Miscellanea -- Juvenile literature (2)
•	Multiplication (2)
•	Decimal system (2)
•	Multiplication -- Juvenile literature (2)
•	Decimal system -- Juvenile literature (2)
•	Machinery (1)
•	International cooperation (1)
•	Dimensions -- Juvenile literature (1)
•	Astronomy -- Pictorial works -- Juvenile literature (1)

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