Columbia subject headings:
Abramowski, Edward, 1868-1918.
Chwistek, Leon, 1884-1944.
Culture--Philosophy--History--20th century.
Czarnowski, Stefan, 1879-1937.
Democracy--History--20th century.
Krzywicki, Ludwik, 1859-1941.
Philosophy.
Harvard subject headings:
Abramowski, Edward, 1868-1918.
Chwistek, Leon, 1884-1944.
Czarnowski, Stefan, 1879-1937.
Krzywicki, Ludwik, 1859-1941.
Poland--Intellectual life--19th century.
Poland--Intellectual life--20th century
Princeton subject headings: