This is one of the foundation books everyone needs to read to get an understanding of what happened at the end of the 1800's. Bird Grinnell was physically there.
This one hardback is an original 1920 version from Yale University Press.
The small hardback from University of Oklahoma Press hard cover is actually my favorite version ... when I can find them.
The re-print paperbacks may have various covers .... but all have the same content.
