Bb5. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 17.
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Bb5. Ewell, Terry B. From unknown source.
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Bb5. Leep, Jeff. In Klimko, Ronald. Bassoon Performance Practices and Teaching in the United States and Canada. Idaho: University of Idaho, 1974, p. 67. "May need teeth on the reed."
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Heckel-system bassoon fingerings by note name