E4-F#4. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 27. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 175. Same as E4-F#4 on Cooper p. 203.

    Eb
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E4-F#4. Houser, Roy. In Klimko, Ronald. Bassoon Performance Practices and Teaching in the United States and Canada. Idaho: University of Idaho, 1974, p. 64. 

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Heckel-System (German) Bassoon Trills and Shakes by Note Names