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References
1.
Barber, R.
, J. A. D. A. , 21 : 1969, 1934 .
2.
Kimball, H.D.
, J. A. D. A. , 23 : 579, 1936 ; Ibid. , 23 : 1904, 1936 .
3.
Sweeney, W.T.
, AND
Schoonover, I.C.
, J. A. D. A. , 23 : 1498, 1936 .
4.
Idem
, ibid. , p. 1501 .
5.
Ref. 1., p. 1979.
6.
Ref. 3., p. 1500.