000			00393nam a2200145Ia 4500
008			140208s9999 xx 000 0 und d
044			_aU.S.A.
080			_a635.21 B467P
100			_aBeukema, H.P.
245			_aPotato improvement some : factors and facts _cH.P. Beukema and D.E. Van Der
260			_b _a _c1979
300			_a224p.;18cm.
700			_aZaag, D.E. Van Der
942			_2udc _cPB
999			_c38376 _d38376