000 003110000a22001450004500
060 _a100
082 _a631.85 GRA
100 _aGray, A N
245 _aPhosphates and superphosphates
260 _aE T Heron & Co Ltd
260 _c1944
300 _a416
650 _aFertilizers phosphates
942 _cBK
999 _c221409
_d221409