000			00265nam a2200097Ia 4500
008			190428s9999||||xx |||||||||||||| ||und||
100			_aEdwards, J. _920270
245		3	_aAn elementary treatise on the diff
250			_b1961. xiii-529
260			_bMacmillan. London, U.K.
999			_c20063 _d20063