Kviljo, Billy Berger has a series of articles coming out in Primitive Archer Magazine soon. He went to the Smithsonian in Washington, DC a few months ago and spent 2 days viewing, photographing and documenting Native bows and arrows from across the US. Jim Hamm and Steve Allaly(?) put out the Encyclopedia of Native American Bows and Arrows(2 volumes). Great pen drawings with dimensions of bows and arrows. Mike(El Destructo), Patrick(Jackcrafty) and others have posted Native American style bows here on PA. Check out the "How To" section and do a search here. Dr. Bert Grayson recently passed but he had an extensive collection of bows and arrows from around the world including many NA bows and arrows. He wrote quite a few articles for PA Magazine and I believe his collection is located at the University of Missouri. You can probably access info there.