Columbia subject headings:
Germans--Relocation--Soviet Union--History--Congresses.
Germans--Russia--History--Congresses.
Germans--Soviet Union--History--Congresses.
Migration, Internal--Russia--History--Congresses.
Return migration--Germany--History--Congresses.
Russia--Emigration and immigration--History--Congresses.
Harvard subject headings:
Germans--Russia--Congresses.
Germans--Soviet Union--Congresses.
Migration, Internal--Russia--Congresses.
Migration, Internal--Soviet Union--Congresses.
Russia (Federation)--Emigration and immigration--Congresses.
Soviet Union--Emigration and immigration--Congresses.
Princeton subject headings: