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- University of Houston3,149
- Petroleum industry and trade2,041
- Shell Oil Company1,706
- Chemical plants1,539
- Petroleum refineries1,538
- LGBTQ community1,349
- LGBTQ people1,349
- Gay liberation movement1,239
- College student newspapers and periodicals1,136
- Historic buildings1,002
- Women962
- Historically Black hospitals950
- Houston Negro Hospital949
- College students870
- Military life753
- Feminism735
- Art696
- USS Houston (CA-30)680
- Ornithology647
- Caricatures and cartoons613