"Even now, however, three RV periods can be established, as follows: 1. early Ṛgvedic period: c.1700-1450 BCE: RV books 4, 5, 6. 2. middle, main Ṛgvedic period : c.1450-1300 BCE: books 3, 7, 8.1-47, 8.60-66 and 1.51-191, most probably also 2; prominent: Pūru chieftain Trasadasyu and Bharata chieftain Sudās and their ancestors, and 3. late Ṛgvedic period: c.1300-1200 BCE: books 1.1-50, 8.48-59 (the late Vālakhilya hymns), 8.67-103, large sections of 9, and finally 10.1-84, 10.85- 191; emergence of the Kuru tribe, fully developed by the time of Parīkṣit a descendant of Trasadasyu... With Indo-Aryan settlement mainly in Gandhāra/Panjab, but occasionally extending upto Yamunā/Gangā, e.g. Atri poem 5.52.17; the relatively old poem 6.45.13 [sic] has gāngya [...] Even the oldest books of the RV (4-6) contain data covering all of the Greater Panjab: note the rivers Sindhu 4.54.6, 4.55.3, 5.53.9 ̳Indus‘; Asiknī 4.17.5 ̳Chenab‘; Paru ṣṇ ī 4.22.3. 5.52.9 'Ravi‘; Vipāś 4.30.11 (Vibali) 'Beas‘; Yamunā 5.52.17; Gangā 6.45.31 with gāngya 'belonging to the Ganges‘ [...] G. van Driem and A. Parpola (1999) believe that these oldest hymns were still composed in Afghanistan [...]. This is, however, not the case as these books contain references to the major rivers of the Panjab, even the Ganges (see above)."