000 nam a22 4500
082 _aThe.631.4
_bP8l
_d1979
100 _aPunya Polapukde
245 _aLand levelling effects on nutritional status of soil and rice plants
260 _aBangkok
_bAsian Institute of Technology
_c1979
942 _c82
999 _c7172
_d7172