- The Amazon River - Profiles of the World’s Great Rivers.
- Colorado River
- Hudson River
- Mississippi River
- Nashua River Watershed Association - Local organization protecting the river and its tributaries.
- North Nashua River USGS Flow Data for 银河娱乐app娱乐app - 400 feet upstream of Fifth Street Bridge.
- Play Amazon Explorer: The Amazon River Game - Requires FLASH plug-in.
- U.S. Geological Service Site