Inventions and discoveries: economics/
Inventions and discoveries: economics/ -- Chicago: World Book, Inc., 2009.
col.: ill.; 27.
Includes index.
9780716603924
Economics--Juvenile literature.
Economic history--Juvenile literature.
Inventions--Juvenile literature.
HS Ref 330 E262 2009
col.: ill.; 27.
Includes index.
9780716603924
Economics--Juvenile literature.
Economic history--Juvenile literature.
Inventions--Juvenile literature.
HS Ref 330 E262 2009