books.google.comhttp://books.google.com/books/about/Two_Papers_on_the_Predicate_Calculus.html?id=qi8PAAAAIAAJ&utm_source=gb-gplus-shareTwo Papers on the Predicate Calculus
I only read the section on finite axiomitizability, but I think it includes an excellent result and the presentation is good, but not great. I am unsure why this paper isn't popular among logicians.
V P Orevkov - 2006 - Journal of Mathematical Sciences
References from web pages
JSTOR: Papers on Predicate Calculus Two papers on the predicate calculus, by sc Kleene (Memoirs of the American Math- ematical Society, no. 10), lithographed, Providence 1952, pp. 1-26. ... links.jstor.org/ sici?sici=0022-4812(195403)19%3A1%3C62%3APOPC%3E2.0.CO%3B2-0