Native American Ledger Art.

"This genre, often called Ledger Art, represents a transitional form of Plains Indian artistry corresponding to the forced reduction of Plains tribes to government reservations, roughly between 1860 and 1900. Due to the destruction of the buffalo herds and other game animals of the Great Plains by Anglo-Americans during and after the Civil War, painting on buffalo hide gave way to works on paper, muslin, canvas, and occasionally commercially prepared cow or buffalo hides." These pages are from Black Hawk's Ledger, more can be found here.