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Here are some links for you photo sleuths (found here):

On Photographs & Photographic Archives

Posters of Edward S. Curtis photographs
American Historical Images On File: The Native American Experience
American Indian Occupation of Alcatraz Island
American Indians of the Pacific Northwest Digital Collection
Benedicte Wrensted: An Idaho Photographer in Focus
Colorado and Western History Photographs
Dawn of a New Day , photograph collections at the Arizona State University Library
Early Photographers Of First Peoples In British Columbia
Edward S. Curtis Photographs : The Cardozo Gallery
Edward S. Curtis's The North American Indian: Photographic Images: from the Library of Congress
Gallery of the Open Frontier , University of Nebraska Press and the National Archives
Heritage Colorado People Photographs
Hopi photographs of Adam Clark Vroman
Images of the Indian Peoples of the Northern Great Plains
Nancy Bellzona's Picture Book , 1896 Oklahoma
National Anthropological Archives
Native American images at American Photochromes
Native American Photographs : Nineteenth Century Images, Pitt Rivers Museum, University of Oxford
North American Indians , stereographs from the Keystone-Mast Collection
Panoramic photographs from the National Archives, including one of a large group on Indians.
Photographs from the Union Pacific Railroad Archives
Picture Collection Online from the New York Public Library
Pictures of Indians in the United States , in the National Archives
Prints and Photographs Reading Room , Library of Congress
Reading Photographs including :: Imaging and Imagining the Ghost Dance: James Mooney's Illustrations and Photographs, 1891-93 by Thomas W. Kavanagh; Reading Photographs by Thomas W. Kavanagh; on the examination of the Wanamaker Collection of American Indian photographs; Domestic Architecture in the Comanche Village on Medicine Creek, Indian Territory, Winter by Thomas W. Kavanagh; Reading Historic Photographs: Photographers of the Pawnee by Thomas W. Kavanagh
Richard Throssel: Photographer of the Crows [Missing 3/15/04]
Selected Photographs from the Helios exhibition at the National Museum of American Art
Smithsonian Photographs
Southern California Indian Images - California Heritage Collection
Southern California Indian Images - San Diego Historical Society
Special Collections and Archives Department, Cline Library , Northern Arizona University
Visual Records Collections , British Columbia Archives