Subjects: the river and i (sorted by popularity)
- Shipwrecks -- Québec (Province) -- Saint Lawrence River Estuary 114 downloads
- Congo River -- Juvenile fiction 112 downloads
- Geology -- Connecticut River Valley 112 downloads
- Shenandoah River Valley (Va. and W. Va.) -- History 110 downloads
- Roanoke River Valley (Va. and N.C.) -- Fiction 110 downloads
- Potomac River 110 downloads
- Tigris River Valley -- Description and travel 110 downloads
- Niger River -- Description and travel 109 downloads
- Floods -- Ohio River Valley 109 downloads
- Hudson River Valley (N.Y. and N.J.) -- History 108 downloads
- Hunting -- Mississippi River Valley 106 downloads
- Pistols -- Mississippi River Valley 106 downloads
- Firearms industry and trade -- Mississippi River Valley 106 downloads
- Ohio River -- History 105 downloads
- Indian pottery -- Mississippi River Valley 105 downloads
- Kankakee River (Ind. and Ill.) -- Fiction 104 downloads
- Saguenay River Valley (Québec) 104 downloads
- Verde River Valley (Ariz.) -- Antiquities 104 downloads
- Footprints, Fossil -- Connecticut River Valley 101 downloads
- Paleontology -- Connecticut River Valley 101 downloads
- Athabasca and Peace River treaty expedition, 1899 100 downloads
- Myxomycetes -- Ohio -- Miami River Valley 99 downloads
- James River (Va.) 98 downloads
- Rhône River (Switzerland and France) 98 downloads
- Arno River Valley (Italy) -- Description and travel 97 downloads