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References
1.Tex. Rsch ,., 4 , 235 -66 (1934 ); ibid. , 5 , 167 -83 (1935 ).
2.
W. Lawrence Balls.
Studies of Quality in Cotton . Macmillan & Co., Ltd. , 1928 . Chap. VIII, Drafting, pp. 121 -47 .