000 00287nam a2200121Ia 4500
008 191031s9999 xx 000 0 und d
100 _aGutschick
245 0 _aLong term strategis for supplying nitrogen to crops
260 _bNTIS
260 _c1977
365 _b16.00
942 _cBK
999 _c205439
_d205439