Betula nigra (River Birch)
- Images, range map, scientific classification, and wetland indicator status. Includes threatened and endangered plant information
- http://plants.usda.gov/java/profile?symbol=BENI

Betula nigra
- Distribution and occurrence, value and use, characteristics, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/betnig/