1. Shaw CF. A preliminary field study of the soils of China (from the “contributions to the knowledge of the soils of Asia, 2” compiled by the Bureau for the Soil Map of Asia. Leningrad: Publishing office of the Academy of Sciences of the USSR; 1933.
2. Marbut CF. The vegetation and soils of Africa. New York: American Geographical Society; 1923.
3. Ramann E. The evolution and classification of soils. Translated by C.L. Whittles. Cambridge: W. Heffer & Sons Ltd; 1928.
4. de’Sigmond AAJ. The principles of soil science. London: Thomas Murby & Co.; 1938.
5. Polynov BB. The cycle of weathering (translated by Alexander Muir, Foreword by Gammie Ogg). London: Thomas Murby & Co.; 1937.