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OPTICS AND VISION
ORGANICISM
ORIENTAL IDEAS IN AMERICAN THOUGHT
ETHICS OF PEACE
INTERNATIONAL PEACE
PERENNIAL PHILOSOPHY
PERFECTIBILITY OF MAN
PERIODIZATION IN HISTORY
PERIODIZATION IN LITERARY HISTORY
PHILANTHROPY
PIETISM
RHETORIC AND LITERARY THEORY IN PLATONISM
PLATONISM IN PHILOSOPHY AND POETRY
PLATONISM IN THE RENAISSANCE
PLATONISM SINCE THE ENLIGHTENMENT
POETRY AND POETICS FROM ANTIQUITY TO THE MID-EIGHTEENTH CENTURY
POSITIVISM IN EUROPE TO 1900
POSITIVISM IN LATIN AMERICA
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POSITIVISM IN THE TWENTIETH CENTURY (LOGICAL EMPIRICISM)
PRAGMATISM
PRE-PLATONIC CONCEPTIONS OF HUMAN NATURE
PRIMITIVISM
PRIMITIVISM IN THE EIGHTEENTH CENTURY
PROBABILITY: OBJECTIVE THEORY
PROGRESS IN CLASSICAL ANTIQUITY
PROGRESS IN THE MODERN ERA
PROPERTY
PROPHECY IN HEBREW SCRIPTURE
PROPHECY IN THE MIDDLE AGES
PROTEST MOVEMENTS
PSYCHOLOGICAL IDEAS IN ANTIQUITY
PSYCHOLOGICAL SCHOOLS IN EUROPEAN THOUGHT
PSYCHOLOGICAL THEORIES IN AMERICAN THOUGHT
PYTHAGOREAN DOCTRINES TO 300 B.C.
PYTHAGOREAN HARMONY OF THE UNIVERSE
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