Subjects: the river and i (sorted by popularity)
- Saint Lawrence River -- Juvenile fiction 160 downloads
- Nile River -- Description and travel 157 downloads
- Neihardt, John Gneisenau, 1881-1973 -- Travel -- Missouri River 152 downloads
- Neihardt, John Gneisenau, 1881-1973 -- Travel -- Yellowstone River 152 downloads
- Yellowstone River -- Description and travel 152 downloads
- Putumayo River Valley 151 downloads
- Japurá River Valley (Colombia and Brazil) 151 downloads
- Columbia River -- History 147 downloads
- Geology -- Amazon River Valley 146 downloads
- Niagara River Valley (N.Y. and Ont.) -- History 145 downloads
- Willamette River Valley (Or.) -- Description and travel 144 downloads
- Indians of North America -- Mississippi River Valley -- Early works to 1800 143 downloads
- Magdalena River (Colombia) 141 downloads
- River life -- Mississippi River -- History 138 downloads
- Brigands and robbers -- Mississippi River Valley -- History 138 downloads
- Brigands and robbers -- Ohio River Valley -- History 138 downloads
- River life -- Ohio River -- History 138 downloads
- Yukon River (Yukon and Alaska) -- Juvenile fiction 136 downloads
- Cane River Region (La.) -- Fiction 135 downloads
- Avon, River (Leicestershire-Gloucestershire, England) 133 downloads
- Hudson River Valley (N.Y. and N.J.) -- Description and travel 131 downloads
- Indians of North America -- Missouri River Valley 130 downloads
- Rivers -- Europe 130 downloads
- Klondike River Valley (Yukon) -- Gold discoveries -- Juvenile fiction 130 downloads
- Red River Settlement -- Juvenile fiction 129 downloads