RVC acknowledges difficulty of providing scientific answers re: indigenous Americans.
R.V. Chamberlin, Letter to Richard R. Lyman, December 3, 1921, Box 16, Folder 7, B.H. Roberts Papers, Marriott Special Collections
There are many questions concerning the native races of America that cannot now be answered scientifically; and it may be even generations before the data shall furnish grounds for the answer. In the meantime the opinions of particular men, even where they merit the title of scientist, must not be given as the conclusions of Science.