1. Bull.;California Department Of Public Works,1923
2. Limiting forms of the frequency distribution of the smallest and largest member of a sample;Fisher;Proc. Camb. Phil. Soc.,1928
3. Duration curves;Foster;Trans. Amer. Soc; Civ. Engr.,1934
4. The return period of flood flows;Gukbel;Ann. Math. Statistics,1941
5. U. S. Geological Survey, , , Instructions for flood frequency compilations, , (revised edition), pp., 1947, .