000 00279nam a2200121Ia 4500
008 170101s1977 xx 000 0 und d
082 _a627 DE
100 _aDE Ridder N. A.
245 0 _aOptimum Use of Water Resources
260 _c1977
300 _a250 p.
942 _2ddc
_cB
999 _c760416
_d760416