000 002590000a22001210004500
008 160428b1931 xxu||||| |||| 00| 0 eng d
041 _aeng
080 _a551.7
_bG7
942 _cBK
100 _aGregory, I.W.
245 _aGeneral stratigraphy
260 _c1931
999 _c8242
_d8242