Online-Zugang zum Findbuch Zentrale Parteikontrollkommission (DY 30/IV 2/4)
German
Online database
http://www.bundesarchiv.de/findbuecher/sapmo/Zdaofind/Findbuch%20ZPKK/index.htm
Academic research
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http://www.michael-culture.org/de/id/eprint/911