RussGus: 4 hits for Jahn, H.

The Bibliographic Database of German Publication on Russia, the Soviet Union and its Successor States (RussGus) contains about 170.000 records from 1974 to 2003 and collects publications of different document types: books, dissertations and other university publications, articles from journals and newspapers including reviews, maps etc. The lists of personal and geographical subjects are located here and here.

Your search for Jahn, H. provides 4 hits
1	Karl Schlögel: Dissens in der Sowjetunion Jahn, H., in: Jahrbücher für Geschichte Osteuropas, 33, 1985, S. 474 (Rezension)
2	Danylo Shumuk: Life Sentence. Memoirs of a Ukrainian Political Prisoner. Ed. by Ivan Jaworsky. Transl. by I. Jaworsky and Halya Kowalska. The Canadian Institute of Ukrainian Studies. The University of Alberta. (The Canadian Library in Ukrainian Studies) Jahn, H., in: Jahrbücher für Geschichte Osteuropas, 33, 1985, S. 474-475 (Rezension)
3	Aldo César Vacs: Descreet Partners Argentina and the USSR since 1917. Transl. by Michael Joyce Jahn, H., in: Jahrbücher für Geschichte Osteuropas, 34, 1986, S. 471-472 (Rezension)
4	Peter Kenez: The Birth of the Propaganda State. Methods of Mass Mobilization 1917-1929 Jahn, H.F., in: Jahrbücher für Geschichte Osteuropas, 35, 1987, S. 310 (Rezension)

The Bibliographic Database of German Publication on Russia, the Soviet Union and its Successor States (RussGus)

Karl Schlögel: Dissens in der Sowjetunion

Danylo Shumuk: Life Sentence. Memoirs of a Ukrainian Political Prisoner. Ed. by Ivan Jaworsky. Transl. by I. Jaworsky and Halya Kowalska. The Canadian Institute of Ukrainian Studies. The University of Alberta. (The Canadian Library in Ukrainian Studies)

Aldo César Vacs: Descreet Partners Argentina and the USSR since 1917. Transl. by Michael Joyce

Peter Kenez: The Birth of the Propaganda State. Methods of Mass Mobilization 1917-1929