It is a bit of a problem to find something, unless you take a stack of books and find half a page in one, four lines in another and so on. There may be some books but I don’t know them, the only one telling a bit more in detail, that i know of is, Elwin Verrier: The Agaria, Humphrey Milford. Oxford University Press, 1942. Try to get it at a library, its about an Indian tribe on the Deccan plateau.
Good luck
Jens
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