000 00289nam a22001217a 4500
082 _a304.6
_bPET
100 _aPetersen william
245 _aPopulation /
_cby William Petersen
260 _aLondon :
_bMacmillan company,
_c1970.
300 _a731p. :
650 _aPopulation
942 _cBK
999 _c304167
_d304167