Betula pubescens
- Information on the downy birch and photographs of it on the Isle of Skye.
- http://www.plant-identification.co.uk/skye/betulaceae/betula-pubescens.htm

Betula neoalaskana (Alaska Paper Birch)
- Describes the habitat, range, and physical characteristics of this species. Includes photos
- http://www.for.gov.bc.ca/hfd/library/documents/treebook/alaskabirch.htm

Betula pumila
- Image and description.
- http://www2.state.id.us/fishgame/info/cdc/plants/plants_A-D/betpum.htm