The oldest papers about this topic are:

Kimball, E. (1951). Pyle-Black Plumage in the Fowl. The American Naturalist 1951 85:823, 265-266
I have to scan it, when I am back to University in January.

Punnett, R.C. (1957). Genetic studies in poultry XIII. Recessive black. Journal of Genetics, December 1957, Volume 55, Issue 3, pp 562569.
http://documents.kippenjungle.nl/#post35

Kimball, E. (1959). Recessive Black. Poultry Science,1959, 38 (1): 225-226

http://documents.kippenjungle.nl/#post34


@ Zenith311 You have to ask the moderator Henk for permission by PM to get access to our documents area.
http://www.the-coop.org/forums/ubbthreads.php?ubb=showprofile&User=354

PS:
Quote:
Smyth (1994) listed a Birchen allele as ERB, the RB standing for "red-brown downed birchen".

http://www.edelras.nl/chickengenetics/mutations1.html#gen_mut_elocus
I think that this is, what Kimball called Pyle Black


Edited by Redcap (12/19/16 08:27 AM)
Edit Reason: Added Henk's Profile
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