1. The classification problem in Russian soil science;Afanasiev,1927
2. Soil classification;Baldwin,1938
3. The Russian approach to soil classification and its recent development;Basinski;J. Soil Sci.,1959
4. Soil-forming factors and soil taxonomy;Bockheim;Geoderma,2014
5. Soil maps of the United States of America;Brevik;Soil Sci. Soc. Am. J.,2013