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Mainz: Kunstgeschichtliches Institut, 1979
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Consortium Erudit, 2020
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University of Chicago Press, 1994
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Medieval Academy of America, 1994
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National Documentation Centre (EKT), 1994
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University of Chicago Press, 1990
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Medieval Academy of America, 1990
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National Documentation Centre (EKT), 1986
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University of Chicago Press, 1983
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The Medieval Academy of America, 1983
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Consortium Erudit, 1983
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National Documentation Centre (EKT), 1981
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Consortium Erudit, 1978
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University of Chicago Press, 1972
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The Mediaeval Academy of America, 1972
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National Documentation Centre (EKT), 1962
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2001
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JSTOR, 1972
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JSTOR, 1959