000			00383nam a2200157Ia 4500
008			130223s9999 xx 000 0 und d
080			_a631.67
100			_aKalisvaart, Ir.C.
245			_aSubirrigation in the Zuiderzee polders
260			_aWageningen
260			_c1958
300			_a56 p.
440			_aInternational Institute for La
901			_pS493
942			_cB _2udc
999			_c134852 _d134852