I think they are all for trombone.
I play flute in a band, and I know that sometimes the low section of bassoon, trombone, etc sometimes have the same music sheets.
The part you may be confused about is the 5th, 6th, and 9th lines where there is multiple notes on one. I've had these before, and you pick either the higher or lower ones to play on the music.
Hope this helps!
