00298nam a2200097 a 450000500170000008200190001710000260003624500660006226000480012830000240017620251203090505.0  a574.5,bD, mac  aMacArthur, Robert, H.  aGeographical ecology: patterns in the distribution of species  aPrincetonbPrinceton University Pressc1984  axviii, 269p, 22 cm.