Hydrological forescasting ; proceedings of the WMO / UNESCO symposium in hydrological forecasting - Geneva : OMM, 1969 - 325 p. : ilus. - Technical note ; 92 . - Technical note ; 92 . LCCN: 36064 Subjects--Topical Terms: HidrologĂa.Recursos hidraulicos. Dewey Class. No.: 631.7 / O7