"The RV hymn X, 75, however, gives a list of names of rivers where Sarasvati is merely mentioned (verse 5) while Sindhu receives all the praise (verses 2-4 and 7-9). This may well indicate a period after the first drying up of Sarasvati (c. 3500 ) when the river lost its preeminence. It is agreed that the tenth Book of the RV is later than the others."