Subjects: the river and i (sorted by popularity)
- Mississippi River Valley -- Discovery and exploration 1140 downloads
- Mississippi River -- Sources 1044 downloads
- Thames River (England) 849 downloads
- Rhine River Valley -- Description and travel 821 downloads
- Rhine River -- Fiction 821 downloads
- Klondike River Valley (Yukon) -- Gold discoveries 808 downloads
- Mississippi River Valley -- Description and travel 778 downloads
- Yakima River Valley (Wash.) -- Antiquities 765 downloads
- Rivers -- Juvenile fiction 695 downloads
- Niger River 684 downloads
- Colorado River (Colo.-Mexico) 660 downloads
- Mississippi River Valley -- History 655 downloads
- Yukon River Valley (Yukon and Alaska) -- Poetry 592 downloads
- Indians of North America -- Missouri River Valley 576 downloads
- Yukon River Valley (Yukon and Alaska) -- Fiction 567 downloads
- Ohio River Valley -- Fiction 558 downloads
- Thames River (England) -- Description and travel 546 downloads
- Indus River Valley -- Description and travel 537 downloads
- Nile River Valley -- Description and travel 532 downloads
- Mississippi River -- Description and travel -- Early works to 1800 530 downloads
- Congo River -- Description and travel 515 downloads
- Amazon River -- Fiction 488 downloads
- Columbia River 464 downloads
- Legends -- Rhine River Valley 454 downloads
- Amazon River Valley -- Description and travel 450 downloads