650 Vedic Manuscripts 60000 Books Sanskrit Pali with British Museum.

But majority of the  works are abroad, mainly in museums. I had written  in earlier lost as to what are  available with USA  Library of Congress and Canada

Where To Look For Ancient Indian Texts US Canada

The Digitized copies  of The Rigveda Brahmanas: the Aitareya and Kausītaki Brāhmanas of the Rigveda are in American Libraries.