Subjects: the river and i (sorted by popularity)
- Mississippi River -- Discovery and exploration 374 downloads
- Indus River Valley -- Description and travel 368 downloads
- Amazon River -- Fiction 368 downloads
- Nile River -- Description and travel 365 downloads
- Columbia River 361 downloads
- Ohio River Valley -- History 354 downloads
- Thoreau, Henry David, 1817-1862 -- Travel -- Merrimack River (N.H. and Mass.) 349 downloads
- Merrimack River (N.H. and Mass.) -- Description and travel 349 downloads
- Concord River (Mass.) -- Description and travel 349 downloads
- Thoreau, Henry David, 1817-1862 -- Travel -- Massachusetts -- Concord River 349 downloads
- Yukon River Valley (Yukon and Alaska) -- History -- 19th century -- Fiction 346 downloads
- Gold mines and mining -- Yukon River Valley (Yukon and Alaska) -- Fiction 346 downloads
- Mississippi River Valley -- Discovery and exploration 345 downloads
- Ohio River -- Description and travel 345 downloads
- Frontier and pioneer life -- Ohio River Valley 336 downloads
- Magdalena River (Colombia) 333 downloads
- Red River Settlement 318 downloads
- Hugo, Victor, 1802-1885 -- Travel -- Rhine River Valley 316 downloads
- Railroads -- Euphrates River Valley 312 downloads
- Amazon River Region -- Juvenile fiction 290 downloads
- Shipping -- Niagara River (N.Y. and Ont.) 289 downloads
- Steam-navigation -- Niagara River (N.Y. and Ont.) 289 downloads
- Rhône River (Switzerland and France) -- Poetry 287 downloads
- Colorado River (Colo.-Mexico) -- Juvenile fiction 278 downloads
- Rivers -- Juvenile literature 271 downloads