000
00287nam a2200109 4500
245
_a
Scientific framework of world water balance
100
_a
Unesco
260
_a
Paris
_b
Unesco
_c
1971
300
_a
27p.; 27cm.-
490
_a
Technical papers in hydrology; no.7
082
_a
551.48
_b
UNESCO
999
_c
26636
_d
26636