Online-Zugang zum Findbuch Sekretariat Helmut Lehmann im ZK der SED 1945 – 1950 (DY 30/ IV 2/2.027)
German
Website
http://www.bundesarchiv.de/findbuecher/sapmo/Zdaofind/Findbuch%20Sekretariat%20Helmut%20Lehmann/index.htm
Academic research
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http://www.michael-culture.org/de/id/eprint/1005