Poor Indians on Rich Land Fight a U.S. Maze
Mary Fish Basquez, 56-year-old Muscogee Indian, receives only few dollars a year from six oil wells on her family's land in Oklahoma under trust system run by Federal Government; her case is one of thousands behind largest class-action suit ever filed by Indians; they say Government, which is required by law to take care of Indian trust lands with high standard of fiduciary responsibility, has managed them with epic ineptitude; trust officials say effort to restore original documents, and then pay out lost money that Indians say may be as high as $10 billion, will be one of hardest things Government has tried to do; Federal Judge Royce C Lamberth in Feb held Interior Sec Bruce Babbitt and Treasury Sec Robert E Rubin in civil contempt for their inability to produce documents in case; photos (M)