E2-C3. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 31. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 179.

E2:                C3:
x x x | x x x F    x x x | o o o(F)
         E                  E

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