Steel, Robert G. D. Principles and procedures of statistics : with special refernce to the biological science / Robert G.D. Steele, James H.Torrie. - New York : McGraw-Hill Book Company, 1960. - xvi, 481 p. : ill. ; 22 cm. Includes index. Subjects--Topical Terms: Statistics. LC Class. No.: HA29 / .S74 1960