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Ballard, Carol.

Keeping fit : body systems / Carol Ballard. - Chicago, Ill. : Heinemann Library, c2008. - 48 p. : col. ill. ; 25 cm. - Do it yourself science .

Includes bibliographical references (p. 46-47) and index.

9781432910860 (hc) 9781432911027 (pb)

2007050642


Physical fitness
Exercise

RA781 / .B228 2008

613.7/1