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<https://www.allmusic.com/artist/bobbi-humphrey-mn0000766562/biography>
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<https://bandestration.com/tag/g-treble-flute/>
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<https://bandestration.com/tag/contra-alto-flute/>
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<https://www.allmusic.com/artist/jean-pierre-rampal-mn0000813814/biography>
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<http://sankyoflute.com/e/catalog/damore.html>
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<https://www.8notes.com/f/25_218809.asp>
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<https://www.allmusic.com/artist/bobbi-humphrey-mn0000766562/biography>
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<http://www.gemeinhardt.com/connect/gemeinhardt-education/flute-history.html>
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<http://www.encyclopedia.com/literature-and-arts/performing-arts/music-theory-forms-and-instruments/flute>
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<http://jupitermusic.com/international/products/woodwinds/flutes/alto-flutes/>
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<https://www.musicalbri.com/fun-facts-about-the-flute/>
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<https://www.vsl.co.at/en/Concert_flute/History>
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<https://www.quora.com/What-is-the-flute-family>
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<https://www.biography.com/people/james-galway-9305726>
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<https://bandestration.com/tag/g-treble-flute/>
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<https://bandestration.com/tag/contra-alto-flute/>
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<https://www.allmusic.com/artist/jean-pierre-rampal-mn0000813814/biography>
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<https://nicolesflute.weebly.com/timeline-of-the-flute.html>
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<http://fabulousflute.weebly.com/timeline-of-flute-history.html>
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<https://www.britannica.com/biography/Theobald-Boehm>