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- Petroleum industry and trade2,038
- University of Houston1,800
- Shell Oil Company1,706
- Chemical plants1,539
- Petroleum refineries1,538
- LGBTQ community1,231
- LGBTQ people1,231
- Gay liberation movement1,123
- Historic buildings1,002
- Historically Black hospitals950
- Houston Negro Hospital949
- Women882
- Military life753
- Feminism735
- USS Houston (CA-30)680
- Ornithology647
- Caricatures and cartoons613
- Commune of Paris (France, 1871)606
- Art583
- Political activists566