The tribes are now happily extinct, I suppose?
I think they still survive in India's forests, although most have quit their ancient ways to integrate with mainstream society. Thse that still do are "protected" from "outside influences" by the federal government and state governments. All through the time, many of them collude with poachers. The Nagas are the ones who have changed most- from head-hunting cannibals to politicians, in a span of a hundred years!
I found this here:
http://www.helptribals.org/pressrelease.htm
The Indian National Trust for the Welfare of Tribals
Here's another:
http://www.kamat.com/colophon/greenroom/camera_monkey/photographing_tribals.htm
Photographing Tribals
Experiences Photographing the Tribals of Bastar
by K. L. Kamat