00321nam a2200121Ia 4500008004100000020001800041040001500059082002200074100003900096245002600135260002600161300001200187231128s9999    xx            000 0 und d  a8-8016-2518-1  aPHSAcPHSA  aCIR  574 R38 1988  aRaven, Peter H. Johnson, George B. 0aUnderstanding biology  aMissouribMosbyc1988  a799  p.