Columbia subject headings:
History--Philosophy.
Knowledge, Theory of.
Political science.
Popper, Karl R. (Karl Raimund), 1902-1994.
Harvard subject headings:
History--Philosophy
Popper, Karl R. (Karl Raimund), 1902-1994--Contributions in philosophy of history.
Popper, Karl R. (Karl Raimund), 1902-1994.
Princeton subject headings:
History--Philosophy.
Popper, Karl Raimund, Sir, 1902---Conbtributions in theory of knowledge.
Popper, Karl Raimund, Sir, 1902---Contributions in political science.