00258nam a2200097 a 450000500170000008200210001710000150003824500450005326000440009830000180014220251203091012.0  a591.525,bD, bak  aBaker, RR.  aEvolutionary ecology of animal migration  aLoNew DelhionbHodder & Stoughtonc1978  a1012p, 24 cm.