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1
On the fourfold root of the principle of sufficient reason.
Published 1974“…Open Court library of philosophy.…”
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2
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3
What is value? An introduction to axiology.
Published 1971“…Open Court library of philosophy.…”
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4
Anselm's discovery: a re-examination of the ontological proof for God's existence /
Published 1965“…Open Court library of philosophy.…”
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5