Subjects: the river and i (sorted by quantity of books)
- Mississippi River -- Discovery and exploration 3 books
- Indus River Valley -- Description and travel 3 books
- Ohio River -- Description and travel 3 books
- Ohio River -- Juvenile fiction 3 books
- Indians of South America -- Amazon River Valley 3 books
- Natural history -- Amazon River Valley 3 books
- Gold mines and mining -- Yukon River Valley (Yukon and Alaska) -- Fiction 3 books
- Yukon River Valley (Yukon and Alaska) -- History -- 19th century -- Fiction 3 books
- Mississippi River Valley -- Juvenile fiction 2 books
- Yukon River (Yukon and Alaska) -- Juvenile fiction 2 books
- Mounds -- Mississippi River Valley 2 books
- Ohio River Valley -- History -- To 1795 2 books
- Columbia River -- Juvenile fiction 2 books
- Klondike River Valley (Yukon) -- Gold discoveries -- Juvenile fiction 2 books
- Frontier and pioneer life -- Mississippi River Valley -- Fiction 2 books
- Saint Lawrence River -- Fiction 2 books
- Yukon River Valley (Yukon and Alaska) -- Poetry 2 books
- Roads -- Ohio River Valley 2 books
- Hudson River Valley (N.Y. and N.J.) -- Description and travel 2 books
- Saguenay River Valley (Québec) 2 books
- Amazon River Valley 2 books
- Ohio River Valley -- Social life and customs 2 books
- Yukon River (Yukon and Alaska) -- Description and travel 2 books
- Amazon River Valley -- Discovery and exploration -- American 2 books
- Negro River (Río Negro, Argentina) 2 books