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References
1.
Cahn, L.R.
Den. Cosmos
77 : 484 , 1935 .
2.IDEM . Ibid.
75 : 203 , 1934 .
3.
Galt, C.B.
J. A. D. A . 21 : 1442 , 1934 .
4.
Bloodgood, J.C.
Ibid.
20 : 1790 , 1933 .
5.IDEM . Ibid.
20 : 1996 , 1933 .
6.
Geschickter, C.F.
Den. Cosmos
75 : 529 , 1933 .
7.
Lyons, C.
J. J. A. D. A . 20 : 3 , 1933 .