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Die ausländische Intervention in Lettland 1918 - 1920
Sipols, Vilnis, (1961)
Cowan's war : the story of British naval operations in the Baltic, 1918 - 1920
Bennett, Geoffrey Martin, (1964)
Central Bank Intervention and Exchange Rate Expectations: Evidence from the Daily DM/US-Dollar Exchange Rate
Reitz, Stefan, (2002)