000 00309nam a22001217a 4500
005 20180626121452.0
008 180626b xxu||||| |||| 00| 0 eng d
040 _cPK-LaUMT
082 _aMJC 910.5
_bNAT-
245 _aNational geographic ( Vol. 177 , no.5)
260 _aWashington , DC.
_c1990
942 _cBK
999 _c105213
_d105213