RussGus: 2 hits for Christiansen, E.

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

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 Christiansen, E. provides 2 hits
1	Eric Christiansen: The Northern Crusades. The Baltic and the Catholic Frontier 1100-1525. (New studies in medevial history, 3) Jähnig, Bernhart, in: Zeitschrift für Ostforschung, 30, 1981, S. 593 (Rezension)
2	Eric Christiansen: The Northern Crusades. The Baltic and the Catholic Frontier 1100-1525 (Die nordischen Kreuzfahrer: Die baltische und die katholische Grenze 1100-1525) Hoffmann, Erich, in: Historische Zeitschrift, 238, 1984, S. 143-144 (Rezension)

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

Eric Christiansen: The Northern Crusades. The Baltic and the Catholic Frontier 1100-1525. (New studies in medevial history, 3)

Eric Christiansen: The Northern Crusades. The Baltic and the Catholic Frontier 1100-1525 (Die nordischen Kreuzfahrer: Die baltische und die katholische Grenze 1100-1525)