Subjects: the river and i (sorted by popularity)
- Mississippi River -- Discovery and exploration 207 downloads
- Ohio River Valley -- Social life and customs 206 downloads
- Colorado River (Colo.-Mexico) -- Juvenile fiction 195 downloads
- Moselle River Valley 194 downloads
- Rivers -- Great Britain 188 downloads
- Red River Settlement 185 downloads
- Rhine River Valley -- Fiction 185 downloads
- Roosevelt River (Brazil) 184 downloads
- Negro River (Río Negro, Argentina) 184 downloads
- Klondike River Valley (Yukon) -- Gold discoveries -- Poetry 182 downloads
- Missouri River -- History 179 downloads
- Steam-navigation -- Missouri River 179 downloads
- Ohio River Valley -- History -- To 1795 176 downloads
- Yukon River (Yukon and Alaska) -- Description and travel 175 downloads
- Amazon River 175 downloads
- Ohio River -- Juvenile fiction 175 downloads
- Yellowstone River Valley -- Fiction 175 downloads
- Amazon River Valley 173 downloads
- Saint Lawrence River -- Juvenile fiction 166 downloads
- Nile River -- Description and travel 165 downloads
- Japurá River Valley (Colombia and Brazil) 152 downloads
- Putumayo River Valley 152 downloads
- Mazaruni River (Guyana) 150 downloads
- Thwaites, Reuben Gold, 1853-1913 -- Travel -- Ohio River 148 downloads
- Skiffs -- Ohio River -- History -- 19th century 148 downloads