William O. Douglas,
United States v. Santa Fe Pacific Railroad Company…
“ Occupancy necessary to establish aboriginal possession is a question of fact to be determined as any other question of fact. If it were established as a fact that the lands in question were, or were included in, the ancestral home of the Walapais in the sense that they constituted definable territory occupied exclusively by the Walapais (as distinguished from lands wandered over by many tribes) , then the Walapais had 'Indian title' which unless extinguished survived the railroad grant of 1866. ”
