Canzona XIII a12 from "Sacrae Symphoniae (1597) (Score & Parts)-12BSN
Composer: Gabrieli, Giovanni
Publisher: Accolade (Germany)
This is scored for 12 bassoons (my site could only accommodate a max of 10, which is why you find it listed under "10" bassoons). It can also be played by 9 bassoons and 3 English horns - parts provided - and there is an ad lib Contrabassoon part, also included.