1856 Niedermeyer Gregorian Accomp. Treatise
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1860 Luxembourg Kyriale
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1905 Solesmes Kyriale (643)
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1920 Solesmes Liber Usualis (Fragment)
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1923 Gastoué Treatise on Gregorian Accompaniment
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1963 Chant According to the Manuscripts (Murray)
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Free Download • “Liber Usualis” PDF Online (Solesmes, 1961)
Free PDF download of the complete “Liber Usualis with Introduction and Rubrics in English—with IMPRIMATUR dated 7 February 1961—edited by the Benedictine Monks of Solesmes+
1886 Du Chant Grégorien (Lemmens)
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1945 The Rhythm of Plainsong (Dom Gajard)
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1818 Antiphonale (Bourguignon)
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1913 Gastoué Treatise on Gregorian Chant
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1900 (?) Lepage Gregorian Accompaniment Treatise
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1924 Boulfard Treatise on Gregorian Accompaniment
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1964 Rayburn Gregorian Chant Rhythm
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1875 Hanisch Sanctorale & Witt Kyriale
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1925 Manzetti Chants of Holy Week
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1949 History of Catholic Church Music (Fellerer)
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1876 Franz Witt Kyriale
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1914 The Teaching & Accompaniment of Plainsong
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1903 Abbé Brune Gregorian Accompaniment Treatise
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