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Charles Francis Atkinson,
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Manuel García Morente
1962, Knopf
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1963, Encyclopaedia Britannica, inc.
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1926, Houghton Mifflin Company
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1970, University Press
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by
Jacques Ellul
1969, Seabury Press
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1964, Barnes & Noble
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by
Ernst Cassirer
1948, Univ. of Chicago Press
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by
Jacques Ellul
1972, Vintage Books