SPIDER WOMAN - The Story of Navajo Weavers and Chanters, first published in 1934, is currently free on the Kindle store. (Thanks to Alex Golub for the tip!)
I sweated blood and tears to write a chapter on “the definition of ethnographic film” for this new book, but the insane price tag will ensure nobody ever reads it: The Routledge International Handbook of Ethnographic Film and Video.