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Names
- United States. Department of Labor8
- United States. Black Lung Benefits Reform Act of 19775
- Cherokee Nation4
- Chickasaw Nation4
- Choctaw Nation of Oklahoma3
- Comanche Nation3
- Iowa Tribe of Oklahoma3
- Kiowa Tribe of Oklahoma3
- Pawnee Nation of Oklahoma3
- United States. Department of Health, Education, and Welfare3
- Delaware Tribe of Indians2
- Osage Nation2
- Seminole Nation2
- Shawnee Tribe2
- United States. Social Security Administration2
- Apache Indians1
- Apache Tribe of Oklahoma1
- Black Lung Association1
- Caddo Nation1
- Caddo Nation of Oklahoma1
