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Stuttgart: Max Hettler Verlag, 1961
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Stuttgart: Hettler, 1955
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Stuttgart: Max Hettler Verlag, 1957
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Stuttgart: Hettler, 1953
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Stuttgart: Hettler, 1956
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Stuttgart: Hettler, 1958
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Stuttgart: Hettler, 1951-1958
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Stuttgart: Hettler, 1951
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Wiesbaden: Harrassowitz, 1971
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University of Chicago Press, 1950
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The Mediaeval Academy of America, 1950
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University of Chicago Press, 1950