Subjects: the river and i (sorted by popularity)
- Pilots and pilotage -- Mississippi River -- Biography 80 downloads
- River life -- Mississippi River -- History -- 19th century 80 downloads
- Indians of North America -- Mississippi River Valley -- Folklore 78 downloads
- Legends -- Mississippi River Valley 78 downloads
- Paraguay River 77 downloads
- Arkansas River -- Description and travel 77 downloads
- Niger River -- Description and travel 77 downloads
- Kankakee River (Ind. and Ill.) -- Fiction 76 downloads
- Danube River -- Navigation -- Fiction 76 downloads
- Mississippi River -- History -- Civil War, 1861-1865 76 downloads
- Rivers -- Canada 75 downloads
- Stanislaus River (Calif.) -- Juvenile fiction 75 downloads
- Amazon River -- Juvenile fiction 75 downloads
- Yangtze River (China) -- Description and travel 74 downloads
- Taquari River (Rio Grande do Sul, Brazil) 74 downloads
- Bermejo River (Bolivia and Argentina) -- Discovery and exploration 74 downloads
- Yellowstone River -- Fiction 74 downloads
- Neckar River Valley (Germany) -- Fiction 73 downloads
- Myxomycetes -- Ohio -- Miami River Valley 73 downloads
- Rhine River -- Description and travel 73 downloads
- Hudson River (N.Y. and N.J.) -- Pictorial works 72 downloads
- River engineering 71 downloads
- Ohio River -- History 71 downloads
- Athabasca and Peace River treaty expedition, 1899 71 downloads
- Barrages -- England -- Thames River 71 downloads