1905 comprehensive study full of hundreds of photographs. "After an expedition of two months in September, October, and November, 1902, among the people of northern Luzon it was decided that the Igorot of Bontoc pueblo, in the Province of Lepanto-Bontoc, are as typical of the primitive mountain agriculturist of Luzon as any group visited, and that ethnologic investigations directed from Bontoc pueblo would enable the investigator to show the culture of the primitive mountaineer of Luzon as well as or better than investigations centered elsewhere."
