My discovery of Edward Sheriff Curtis has found me with such a situation today (see previous post on Curtis). I live in a neighboring town to Salem, MA. In the Peabody Essex Museum you will find the largest collection of Edward S. Curtis photography found anywhere! Right under my nose.
Do yourself a favor. Visit the Peabody Essex website under their collections/photography, and view these photos as well as the video about Curtis by Thomas Haukaas, M.D. Sicangu Lakota Artist & Psychiatrist http://www.pem.org/curtis/ click on video.
His view of Curtis is one I believe in as well. The photography is magnificent!
If you can't visit the museum, you can get a good representation by viewing their photos at the Peabody Essex museum website. This museum is a hidden jem in the Boston landscape.