Subjects: the river and i (sorted by popularity)
- Juniata River Valley (Pa.) -- Genealogy 66 downloads
- Indians of North America -- Pennsylvania -- Juniata River Valley 66 downloads
- Frontier and pioneer life -- Pennsylvania -- Juniata River Valley 66 downloads
- Athabasca River Valley (Alta.) -- Fiction 66 downloads
- Ohio River -- Fiction 65 downloads
- Susquehanna River -- Juvenile fiction 65 downloads
- Colorado River (Mendoza and Neuquén-Buenos Aires, Argentina) 64 downloads
- Boats and boating -- Colorado River (Colo.-Mexico) 63 downloads
- Hudson River Valley (N.Y. and N.J.) -- Social life and customs -- Juvenile fiction 63 downloads
- Boats and boating -- Green River (Wyo.-Utah) 63 downloads
- Fur traders -- Yellowstone River Valley -- Fiction 63 downloads
- Mississippi River -- Discovery and exploration -- Juvenile fiction 62 downloads
- Crystal River (Colo.) 62 downloads
- Danube River -- Juvenile fiction 62 downloads
- Palms -- Amazon River Valley 61 downloads
- River engineering 60 downloads
- Ohio River -- Poetry 60 downloads
- Oklawaha River (Fla.) -- Description and travel -- Juvenile fiction 60 downloads
- Barrages -- England -- Thames River 60 downloads
- Mondego River (Portugal) 59 downloads
- Allagash River (Me.) -- Juvenile fiction 59 downloads
- Saint Lawrence River Region -- Fiction 59 downloads
- Smoky Hill River Valley (Colo. and Kan.) -- Pictorial works 58 downloads
- Indians of North America -- Mississippi River Valley 57 downloads
- Yukon River Valley (Yukon and Alaska) -- Juvenile fiction 57 downloads