1. Problems of raindrop impact erosion;EKERN;Agric. Engng. St. Joseph, Mich.,1953
2. Studies of raindrop erosion;ELLISON;Agric. Engng. St. Joseph, Mich.,1944
3. Erosion characteristics of rainfall;FREE;Agric. Engng. St. Joseph, Mich.,1960
4. FYALL , A. A. KING , R. B. 1967 Proceedings of the second Meersburg Conference on rain erosion and allied phenomena (2 vols) Royal Aircraft Establishment
5. FYALL , A. A. KING , R. B. 1970 Proceedings of third International Conference on rain erosion and allied phenonena (2 vols) Royal Aircraft Establishment