000			00551nam a2200193Ia 4500
008			131223s9999 xx 000 0 und d
040			_aISI KOLKATA
041			_aEnglish
082			_a631.6 _bN469
100			_aBoon G K
110			_aNetherlands Economic Institute
245			_aCase study of a construction process _bfield trenches
260			_aRotterdam _bNEI _c1960
300			_a21p.
500			_aAlternative techniques of production, progress report; no.5
650			_aDrainage of farm land
650			_aField trenches
942			_cBK
999			_c88519 _d88519