00810cam a2200265 4500 546524532 TxAuBib 20100310120000.0 090115s2008||||||||||||||||||||||||eng|u 2007032266 9781404242821 20.00 1404242821 20.00 TxAuBib Ballard, Carol. Exploring magnets and springs / Carol Ballard. New York : Rosen Publishing, 2008. 32 p ; cm. (How does science work?) Includes index. 20100310. Magnets Juvenile literature. Springs (Mechanism) Juvenile literature. (How does science work?.) TXGAI