00512    a2200169   4500003000800000008004100008020001500049041001200064082001300076100002200089245010000111260004200211300001700253440003100270650002100301700002000322WUSLLib201015b           ||||| |||| 00| 0 eng d  a056501076x  aEnglish  a612bWHI  aWhitfield, Philip  aWhy does my heart beat?:bquestions about the human body answered by the natural history museum  aLondon:bMarshall Editions Ltd,c1988  a95p.;c29cm.  aThe Natural History Museum  aHuman Physiology  aWhitfield, Ruth