From the National Congress of American Indians YouTube page, addressing their opposition to harmful "Indian" sports mascots:

Utes--Chief Sevara [i.e., Severo] and family, ca. 1899

Papago matron, ca. 1907 Waiting for the seal, 1915
The two images above are from a work by Edward Sheriff Curtis, published from 1907-1930, called The North American Indian. The entire work is available electronically here, by Northwestern University Library's Digital Collections. [Note: "The images and descriptions reflect the prevailing Euro-American cultural perspective of Curtis’s time, that Indians were “primitive” people whose traditions represented a “vanishing race”. Contemporary readers should view the work in that context."]
Rez Life: An Indian's Journey Through Reservation Life
by
Celebrated novelist David Treuer has gained a reputation for writing fiction that expands the horizons of Native American literature. In Rez Life, his first full-length work of nonfiction, Treuer brings a novelist’s storytelling skill and an eye for detail to a complex and subtle examination of Native American reservation life, past and present. With authoritative research and reportage, Treuer illuminates misunderstood contemporary issues of sovereignty, treaty rights, and natural-resource conservation. He traces the waves of public policy that have disenfranchised and exploited Native Americans, exposing the tension that has marked the historical relationship between the United States government and the Native American population. Through the eyes of students, teachers, government administrators, lawyers, and tribal court judges, he shows how casinos, tribal government, and the Bureau of Indian Affairs have transformed the landscape of Native American life. A member of the Ojibwe of northern Minnesota, Treuer grew up on Leech Lake Reservation, but was educated in mainstream America. Exploring crime and poverty, casinos and wealth, and the preservation of native language and culture, Rez Life is a strikingly original work of history and reportage, a must read for anyone interested in the Native American story.