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2. Rainfall Frequency Atlas of the United States;Hershfield;U.S. Weather Bur., Tech. Rep.,1961
3. Atlas de profundidad duraccion frequencia de Iluvias en Venezuela;Ministerio de Obras Publicas;Pub. Tec.,1963
4. Elements of Hydrology;Meyer,1928
5. Military airfields: design of drainage facilities;Hathaway;Trans. Am. Soc. Civ. Eng.,1945