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- Petroleum industry and trade2,038
- Shell Oil Company1,706
- Chemical plants1,539
- Petroleum refineries1,538
- LGBTQ community1,231
- LGBTQ people1,231
- Gay liberation movement1,123
- Historic buildings981
- Historically Black hospitals930
- Houston Negro Hospital929
- Feminism732
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- Hospitality industry527
- Suffragists499
- Women's suffrage499
- Suffrage498
- University of Houston475
- Cullinan, Joseph S.421