Library of Congress Authorities online (2002-) http://id.loc.gov/authorities/names/n81062583
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Preussisches Staatshandb. f. d. Jahr 1939: p. 14 (the Prussian Ministerium des Innern was merged with the Reichsministerium des Innern on 11/1/34 under the name Reichs- und Preussisches Ministerium des Innern in effect abolishing the Preussian Ministery; in 1938 it became simply Reichsministerium des Innern) |