1. Soil physics;BAVER L. D.,1940
2. Soil sampling tools;BROWN J. B.,1945
3. Citrus irrigation practices;ESSELEN D. J.;S. Africa Dept. Agric,1937
4. Studies on capacities of soils for irrigation water, and a new method of determining votume weight;ISRAELSEN O. W.;J. agric. Res.,1918
5. Use of irrigation water on farm crops;PALMER A. E.,1939