Here’s a video showing how to find the ebook versions of Lewis and Clark Through Indian Eyes and Mongrel Nation. Note that Lewis and Clark through Indian Eyes only allows for one user at a time, but Mongrel Nation will allow all students to view it at once.
One update to the information in the video: The librarian I was speaking with told me that each user needs to “return” the ebook when they’re finished in order to free it up for the next user. However, there doesn’t appear to be any way to return the ebook. Instead, from what I see, the eBook remains open to that user until they have been inactive for ~30 minutes.