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) Plains Apache identity is symbolized by the Naisha warrior society called Blackfeet ; special songs and dances are performed to recall this aspect of indigenous culture , according to Lecturer in Sociology and Anthropology Michelle Stokely , Ph.D. Currently there are only about 2,000 Plains Apache people residing in southwest Oklahoma , with tribal offices located in Anadarko OK. Louis , and will receive his Ph.D. in Mathematics from U of M in 1999 . England with William the Conqueror , who assigned them lands for the services done him in the North of England , where they lived in great esteem , and the successors after them for several ages , till the time of Sir Gosselin . Dr Grady received an honours degree in chemistry and geology from the University of Durham in 1979 , then went on to complete a Ph.D. on carbon in stony meteorites at the University of Cambridge in 1982 . All other prospective students ( including graduates from a Studienkolleg in Germany , will find the key information that they need at the " entrance requirements " page .