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Subject
- Shell Oil Company1,706
- Petroleum industry and trade1,705
- University of Houston1,582
- Chemical plants1,539
- Petroleum refineries1,538
- LGBTQ community1,231
- LGBTQ people1,231
- Gay liberation movement1,123
- Historic buildings970
- Historically Black hospitals950
- Houston Negro Hospital949
- Women882
- Military life753
- Feminism735
- USS Houston (CA-30)680
- Ornithology647
- Caricatures and cartoons608
- Commune of Paris (France, 1871)606
- Political activists566
- Suffragists510