000 00287nam a2200109 4500
245 _aScientific framework of world water balance
100 _aUnesco
260 _aParis
_bUnesco
_c1971
300 _a27p.; 27cm.-
490 _aTechnical papers in hydrology; no.7
082 _a551.48
_bUNESCO
999 _c26636
_d26636