Shinken said:
I am especially interested in native american crafts,
Not directly Native American, but these people use techniques used by Native peoples the world over for thousands of years.
http://www.braintan.com
The site is owned by Matt Richards, author of the book "Deerskin into Buckskins How to tan with brains, soap or eggs". The website reflects what is in the book, and can sell all the supplies and equipment you might need.
I have the book and it is very clear and precise.
Also, another book on the subject is, "Buckskin, the ancient art of braintanning", by Steven Edholm and Tamara Wilder. Published by Paleotechnics. ISBN 0-9654965-4-6
Eric