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- Shell Oil Company1,706
- Petroleum industry and trade1,705
- Chemical plants1,539
- Petroleum refineries1,538
- LGBTQ community1,231
- LGBTQ people1,231
- Gay liberation movement1,123
- Historic buildings949
- Historically Black hospitals930
- Houston Negro Hospital929
- Feminism732
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- Suffragists499
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- Suffrage498
- Cullinan, Joseph S.421
- USS Houston (CA-30)335