World water balance and water resources of the earth  Studies and reports in hydrology 
Unesco 
 - U.S.S.R  Unesco press  1978 
 - 663p. 
<br/><br/><label>ISBN: </label>92-3-101497-8 
<br/><br/><label>LC Class. No.: </label>UN9  / .U54 1978