000 00334nam a2200133Ia 4500
008 130223s9999 xx 000 0 und d
245 _aTrace elements in soils and crops : Proceedings
260 _aLondon
260 _c1971
300 _a217 p.
440 _aNo. 21; Great Britain Ministry
901 _pS20411
942 _cB
_2udc
999 _c135719
_d135719