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1 |
Speculum / Vol. 25. (1950)
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2 |
The notation of polyphonic music Apel, Willi. - Cambridge, Mass. : Medieval Academy of America, 1949, 4. ed., rev. and with commentary
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3 |
Speculum / Vol. 23. (1948)
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4 |
Harvard dictionary of music Apel, Willi. - Cambridge, Mass. : Harvard Univ. Pr., 1947, 5. print.
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5 |
Masters of the keyboard Apel, Willi. - Cambridge, Mass. : Harvard Univ. Pr., 1947
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6 |
Harvard dictionary of music Apel, Willi. - Cambridge, Massachusetts : Harvard Univ. Pr., 1945, 3. print.
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7 |
The notation of polyphonic music Apel, Willi. - Cambridge, Massachusetts : Mediaeval Academy of America, 1945, 3., corrected ed.
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8 |
Harvard dictionary of music Apel, Willi. - Cambridge, Mass. : Harvard Univ. Pr., 1944
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