There have been quite a few histories of photography and even histories of pictorialism published in the last decade that mention her at least once, but I haven't come across any books dedicated to just Anne Brigman other than the two you mention.
There's a more complete bibliography, including references to Camera Work articles that you can probably find online, here:
http://kls-design.net/article.html
The Library of Congress has a high-res tiff of "Kodak" if you want to make your own wallpaper :-)
The Luminous Lint website is also generally useful for pictorialist info, but in this case doesn't offer much beyond a survey.
Probably your best bet is to see if the Santa Barbara Museum of Art has any copies of "A Poetic Vision" tucked away in the bookshop storeroom.