Canadian Rose Society Winter Hardy Roses
- Links to images and descriptions of the Explorer and Parkland series of hardy and disease-resistant roses developed by Agriculture Canada.
- http://www.canadianrosesociety.org/hardyroses/crs_hardy.html

Roses for the North
- Rates rose varieties and species for ability to survive and flower in USDA Plant Hardiness Zone 4a, and discusses factors affecting rose survival in cold climates. Contains the entire text of the book.
- http://www.extension.umn.edu/distribution/horticulture/DG6594.html

The Buck Rose Homepage
- Descriptions and pictures of hardy roses developed at Iowa State University by Dr. Griffith Buck, and a list of nurseries selling these roses.
- http://www.ag.iastate.edu/centers/cad/rose1.html