Bassoon: Fingering Charts — Finger Chart
Finger Chart is a free site with interactive fingering charts for flute, oboe, clarinet, bass clarinet, saxophone, bassoon, trumpet, horn, trombone, euphonium, baritone and tuba. Users select a note to see the fingering and hear it at concert pitch, and each chart can be printed as a PDF. It's aimed mainly at developing players and students learning secondary instruments.
Bass Trombone, brief description
“The bass trombone is a slide trombone with two valves that are operated by the left thumb. The valves make it possible to lower the instrument’s pitch from Bb to F or D. The entire chromatic scale only becomes available thanks to the thumb valve (F tuning) and an additional third-valve (D tuning).”
Bass Trombone: Instrument Studies for Eyes and Ears — Jacobs School of Music
Instrument Studies for Eyes and Ears, by Don Freund, site designed by Reid Merzbacher