. . "Opéras pour la jeunesse 20e siècle Partitions chant et piano." . . "Comédies musicales 20e siècle Partitions chant et piano." . . "New York Public Library. Music Division." . . . . . "Down in the valley an American folk opera"@en . . . . . . . . . . . . "Down in the valley" . "Down in the Valley, etc" . . . . "Down in the valley Vocal score" . . . . "Vocal scores" . . . . . "Down in the Valley ... Chorus parts, etc" . . . . . . . . . "Down in the valley = Drunten im Tal" . "Down in the valley : opera" . . . "Down in the valley"@en . "Down in the valley" . . "Down in the valley. Vocal score" . "Down in the Valley" . . . "Down in the valley : [folk opera in one act]" . "Drunten im Tal" . . . . . "Down in the valley : vocal score"@en . . "Operas" . . . . "Manuscripts"@en . "Down in the valley. . Music by Kurt Weill. Libretto by Arnold Sundgaard. Vocal score" . . . . . . . "Down in the valley : an American folk opera"@en . . . . . . "Down in the valley : Pu" . . .