1. Ecosystem geography: from ecoregion to sites;Bailey,2009
2. The settlements of grasslands;Edwards,1948
3. The Oxford history of the American people;Morison,1965
4. The beginnings of crested wheatgrass in North America;Dillman;Journal of the American Society of Agronomy,1946
5. The Swift Current Research Station 1920-70;Campbell,1971