Lakota language forum.
From the page: The following charts will be useful in deciphering the orthographies used by other publications, but note that not every author transcribes words accurately using these systems.
From the website: Lakota youth at St. Joseph's Indian School learn their Native language and traditions. Sharing these lessons and our cultural resources around the globe helps preserve the Lakota (Sioux) culture and give Native American youth hope for a bright future.
Lakota language resources.
Free online PDF of a dictionary originally published in 1866.