Subjects: the river and i (sorted by popularity)
- Roads -- Ohio River Valley 112 downloads
- Mississippi River Valley -- Juvenile fiction 110 downloads
- Columbia River -- History 110 downloads
- Hudson River (N.Y. and N.J.) -- Guidebooks 110 downloads
- Missouri River -- History 108 downloads
- Steam-navigation -- Missouri River 108 downloads
- Bates, Henry Walter, 1825-1892 -- Travel -- Amazon River Valley 103 downloads
- Fishing -- England -- Tees River 102 downloads
- Yellowstone River Valley -- Fiction 98 downloads
- Indians of South America -- Amazon River Valley -- Languages 97 downloads
- Cane River Region (La.) -- Fiction 94 downloads
- Negro River (Río Negro, Argentina) 94 downloads
- Bièvre River (France) 92 downloads
- Yakima River Valley (Wash.) -- Antiquities 92 downloads
- Moselle River Valley 92 downloads
- Yukon River (Yukon and Alaska) -- Juvenile fiction 91 downloads
- Fleet, River (England) 91 downloads
- Missouri River -- Juvenile fiction 91 downloads
- Floods -- New Jersey -- Passaic River Valley 90 downloads
- Mississippi River Valley -- Social life and customs 88 downloads
- Klondike River Valley (Yukon) -- Gold discoveries -- Juvenile fiction 86 downloads
- Church architecture -- Rhine River Valley 86 downloads
- Cathedrals -- Rhine River Valley 86 downloads
- Red River of the North 83 downloads
- Madeira River (Brazil and Bolivia) -- Description and travel 81 downloads