LITERATURVERZEICHNIS. 
a) Allgemeine Werke. 
1. Bowman, M. L., urn] Crossley, B. W.: “Corn-Growing, Judging, Breeding, Feeding, Marketing"’. 
2. Burtt-Davy, Joseph: “Maize: Its History, Cultivation, Handling and Uses” (1914). 
3. Harshberger, John, W.: “Maize: A Botanical and Economic Study”. 
4. Hoffmeister, J.: „Das Klima Niedersachsens“ (1930). 
5. Hunt, Thomas F.: "The Cereals in America”. 
6. Huntington, Ellsworth und Williams, Frank E.: “The World’s Great Products and their Climatic Optima"’ (1922). 
7. Jones, Clarence F.: “South America” (1931). 
8. Leppan, H. D.: a) “Agricultural Policy in South Africa” (1931). b) “The Agricultural Development of Arid and Semi-arid 
Regions” (1928). 
9. Leppan, H. D. und Bosman, A. M.: “Field Crops in South Africa”. 
10. Montgomery, E. G.: “The Corn Crops“. 
11. Odium, Georg M.: “Maize in Rhodesia”. 
12. Saunders, A. R.: “Maize in South Africa” (1930). 
13. Shanaham, E. W.: “South America — An Economical and Regional Geography with an Historical Chapter” (1927). 
14. Smith, J. Russel: a) “North America — Its People and the Resources, Development, and Prospects of the Continent as an 
Agricultural, Industrial and Commercial Area"’. !>) “The World’s Food Resources”. 
15. Smith, J. Warden: “Agricultural Meteorology”. 
b) Zeitschriften. 
16. Baker, Oliver E.: ' Agricultural Regions of North America”. ‘The Corn Belt’. Economic Geography Vol. III No. 4, (Oct. ¡937). 
17. Bosman. G. J.: „Die vernaamste Oorsake van Swak Mielie-opbringste in die Unie“. Joernaal Deoartement van Landbou 
(Dez. 1921). 
18. Bosman, G. J. en Osborn. J. B.: „Die Mielienvwerheid van Suid-Afrika“. Joernaal Departement van Landbou Deel VIII No. 2 
(Febr. 1924). 
19. Burtt-Davy, Joseph: a) “Climatic Requirements of the Maize Crop”. Transvaal Agricultural Journal Vol. VII No. 27. b) “The 
Maize Industry of South Africa”. Paper read at the First Annual Union Farming Congress, Pretoria (Oct., 1911). 
20. Cornell, H. H.: “The Problem of Organic Matter in the Soils of the Maize Belt”. The Sun Agricultural Journal of South 
Africa (June 1931). 
21. du Toit, J. J.: „Gemengde Boerdery in die Somerreenvalstreek“. Boerdery in Suid-Afrika (Sept. 1933). 
22. Pick, J. C.: „Bemisting van Mielies“. Boerdery in Suid-Afrika (Julie 1933). 
23. Geldenhuys, F. E.: „Landbou-ekonomiese Toestande in Suid-Afrika“. Joernaal Departement van Landbou, (Jan. 1926). 
24. Hutcheon, James: “The Influence of Geographical Conditions on the Economic Development of South Africa”. Journal of In 
dustries Vol. V, No. 6 (June 1922). 
25. Jortasson, Olof: “Agricultural Regions of Europe”. Economic Geography Vol. II, No. 1 (Jan. 1926). 
26. Jones, Clarence F.: “Agricultural Regions of South America”. Economic Geography Vol. IV, No. 1 (Jan. 1928). 
27. Kiesselbach, T. A.: “Ear type selection and yield of Dent Corn”. Journal American Society of Agronomy 14. 
28. „Verbetering van ons Mielie-opbringste“. Landbou-weekblad (2. Mai 1934). 
29. Parish, E.; “Economics of Maize Growing in South Africa“. Journal Department of Agriculture (March 1924). 
30. Roberts, M. C.: “Rumania To-day”. Economic Geography Vol. IX, No. 3 (July 1933). 
31. Smith, J. Warden: “The Effect of Weather on the Yield of Crops”. Washington Monthly Weather Review 43 (1915). 
32. Taylor, Griffith: “Agricultural Regions of Australia”. Economic Geography Vol. VI, No. 3 (July 1930). 
33. Wellington, J.: “Some Geographical Factors affecting Agriculture in South Africa”. The South African Geographical Journal 
Vol. VI (1923). 
c) Bulletins. 
34. Chilcott, E. G.: “The Relations between Crop Yields and Precipitation in the Great Plains Area”. U. S. Dept, of Agriculture, 
Miscellaneous Circular 81 (1927). 
35. “Climate and Meteorology”. Reprint from the Official Yearbook of South Africa, No. 10. 
36. Props, G. S.: “Losses of Moisture and Plant Food by Percolation”. Texas Agric. Exp. Station Bulletin No. 171, December 1914.