I am currently looking into Crow Mythology and every website I've seen says essentially "The Native Americans thought of the crow as X". But "NATIVE AMERICANS" is too broad a category! Where are they getting this information from? No citations are ever presented. For example, here:

Crow - Crow is the keeper of the sacred law. In Native American folklore, the intelligence of crows is usually portrayed as their most important feature. According to Native American legends and myths, some tribes believed that the Crow had the power to talk, and was therefore considered to be one of the wisest of birds.

Is there any repository of Native American folklore that would have this kind of information? The closest I have found, specifically about crows, is Hopi and Zuni folklore "talk", again without any citations though.