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Subject (Region)
- Mississippi River748
- Missouri River666
- United States574
- District of Columbia376
- Ohio River326
- Potomac River215
- Pennsylvania212
- Minnesota210
- New York196
- California195
- Illinois194
- New York (State)191
- Louisiana178
- Tennessee River167
- England161
- Monongahela River (Pennsylvania/West Virginia)156
- Columbia River (Canada/Oregon/Washington)138
- Arkansas136
- Missouri135
- New Jersey126