00265nam a2200109 a 450000500170000008200130001710000210003024500280005125000120007926000420009130000220013320251203090505.0  a577bODU  aOdum, Eugene, P.  aFundamentals of ecology  a3rd ed.  aPhiladelphiabW.B. Saunders Co.c1971  axvi, 574p, 23 cm.