Cite this: Morton, Samuel George. 1839. Crania americana or, A comparative view of the skulls of various aboriginal nations of North and South America. To which is prefixed an essay on the varieties of the human species. Illustrated byseventy-eight plates and a colored map., Philadelphia : J. Dobson; London : Simpkin.Marshall & co.
Supplied Caption: Drawing of Mexican heads copied from antique Toltecan bas-relief. Depiction from Samuel Morton's 19th century phrenological study of North and South American aboriginals.