Columbia subject headings:
Europe, Central--Politics and government--20th century.
Europe, Eastern--Politics and government--20th century.
Specialists--Europe, Central--History.
Specialists--Europe, Eastern--History.
Technology and state--Europe, Central--History.
Technology and state--Europe, Eastern--History.
Technology--Europe, Central--History.
Technology--Europe, Eastern--History.
Harvard subject headings:
Europe, Central--History--20th century.
Europe, Central--Politics and government--20th century.
Europe, Eastern--History--20th century.
Europe, Eastern--Politics and government--20th century.
Specialists--Europe, Central--History--20th century.
Specialists--Europe, Eastern--History--20th century.
Technology--Europe, Central--History--20th century.
Technology--Europe, Eastern--History--20th century.
Princeton subject headings:
Europe, Central--Politics and government--20th century.
Europe, Eastern--Politics and government--20th century.
Specialists--Europe, Central--History.
Specialists--Europe, Eastern--History.
Technology and state--Europe, Central--History.
Technology and state--Europe, Eastern--History.
Technology--Europe, Central--History.
Technology--Europe, Eastern--History.