Charles Milton Bell was one of Washington, D.C.'s leading portrait photographers during the last quarter of the nineteenth century. Today, he is best known for his photographs of Native Americans, which he began to produce in 1873. Further information about this individual or organization may be available in the Special Collections Research Center Wiki: http://scrc.swem.wm.edu/wiki/index.php/C. M. Bell (Charles Milton).
Library of Congress, Washington, D.C. pamphlet, "Washingtoniana Photographs" by Kathleen Collins, 1989.