000 00333nam a2200109Ia 4500
008 220214s9999 xx 000 0 und d
100 _aColwell J.D.
245 0 _aCalibration and assessment of soil tests for estimating fertilizer requirements
260 _bAustralian Journal of Soil Research
_c1968
300 _a93-103
942 _cRE
999 _c46025
_d46025