Heckel B2-C#3

B2-C#3. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 21. "...close two with [right] thumb":

x x tr | o o o
   w    Bb E

B2-C#3. Ewell, Terry B. (19 Feb. 95). Source unknown.

x x tr | x o o
          E
    D

B2-C#3. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 172.

x x tr | x o o
   w
   D

       c#-tr
x x x | x o o
       Bb