What adds to the force of the archaeological evidence (of continuity in material and ethnic culture) is the fact that there is considerable acceptabl… - Shrikant G. Talageri

As we saw, there is a large class of personal names and name-elements common to the Late Books and hymns of the Rigveda (386 hymns in the Late Books of the Rigveda and 8 Late hymns in the earlier Books), and to the Avesta (the bulk of the names, right from the name of the first composer of the Avesta, and the names of his closest associates), the Mitanni (including every common name element known), and the Kassites (the only known name). These names and name-elements are fundamental to all four groups, but completely absent in the Early and Middle Books of the Rigveda (apart from the 8 Late hymns mentioned earlier). And all these names and name-elements are very common in post-Rigvedic texts.

The sooner these anti-invasionist scholars realize that linguistics is a science which cannot, and indeed need not, be wished away, and the sooner they decided to expend their energies in the study, rather than the dismissal, of this science, the better they will be able to serve their own cause.

“I have shown in my books that the ten books of the Rigveda were composed in the following order: 6,3,7,4,2,5,8,9,10 (with parts of book 1 spanning the periods of composition of books 4,2,5,8,9,10); and that they were composed as follows: books 6,3,7 in the Early Rigvedic period, books 4,2 in the Middle Rigvedic period, and books 5,1,8,9,10 in the Late Rigvedic period (the hymns of book 1 having been given their final form in the Late Rigvedic period, this book must be included in that period).
To begin with, the western academic scholars themselves (see TALAGERI 2008:132-135 for details) have classified the books of the Rigveda into two groups: the family books (2-7) and the non-family books (1, 8-10), and testified, on the basis of their own analyses, that the family books were composed and compiled before the non-family books. Further, they have detached book 5 from the other family books and concluded that it agrees with the non-family books rather than with the other family books. By their analysis, the books of the Rigveda can be classified into three categories: the earlier family books (2-4, 6-7), the later family book (5), and the later non-family books (1, 8-10). This fully agrees with my own classification into Early books (6,3,7), Middle (4,2) and Late books (5,1,8,9,10); except that the Early and Middle books are clubbed together in one category in the western classification, and the internal order within the groups is not analyzed. [In sum, we get four categories: Early family books 6,3,7; Middle family books 4,2; Late family book 5; and Late non-family books 1,8,9,10]