D5-Eb5. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 29.

o o o | o o x Ab

D5-Eb5. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 178.

 eb-tr Eb
o  o  x  | o o(x)(Ab)

     Eb c#
 o o o | o tr tr Ab

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