D3. Birnstingl, Roger. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 66. For slur from D4 to D3 use this fingering on D3:

D3:
   x x o | o o o F
      w          Ab

D3. Cooper, L. Hugh. The Double Reed 1/3 (December 1978): 31. For pianissimo slur from D3 to D4. For D3 L. H.: thumb D, C, B, and Bb keys; cover E and D holes; Db key. R. H.: thumb E key. For D4: L. H.: thumb D, C, B, and Bb keys; cover E and D holes; Db key. R. H.: nothing.

D3:                        D4:
        Db                         Db    
 x  x  o  | o o o           x  x  o  | o o o
             E             Bb B C D
Bb B C D

D3. Corey, Gerald. In Klimko, Ronald. Bassoon Performance Practices and Teaching in the United States and Canada. Idaho: University of Idaho, 1974, p. 65.

x x o | o o o F
   w

D3. Golloway, David. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 60. Add thumb Bb key to stabalize pitch on some instruments.

D3. Lewis, William. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 73. For Slur from D3-Eb2.

D3:                  Eb2:
    Eb                   Eb
x x o | o o x F      x x x | x x x F
   w     E              w     E
    D                    D

D3. Polonchak, Richard M. The Double Reed 1/3 (December 1978): 31. For pianissimo.

x  x  o  | o o o
     wlock
Bb B C D

D3. Scheller, Stanley. In Klimko, Ronald. Bassoon Performance Practices and Teaching in the United States and Canada. Idaho: University of Idaho, 1974, p. 69. For pianissimo.

x x o | x o o
   w   Bb

Heckel-system bassoon fingerings by note name