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- Petroleum industry and trade2,038
- Shell Oil Company1,705
- Chemical plants1,539
- Petroleum refineries1,538
- LGBTQ community1,231
- LGBTQ people1,231
- Gay liberation movement1,123
- Historic buildings973
- Historically Black hospitals950
- Houston Negro Hospital949
- University of Houston792
- Feminism735
- Women713
- Military life652
- Ornithology647
- Political activists536
- Hospitality industry527
- USS Houston (CA-30)514
- Suffragists510
- Women's suffrage510