Scores and Parts
Milano: G. Ricordi & C., n.d.. Plate 52977.
Public Domain [tag/del]
||Quartetto for 4 Winds with Pianoforte
||Quartetto per Flauto, Oboe, Piccolo Clarino in Mi♭ e Clarino in Si♭ con accompagnamento di Pianoforte
As a Quartetto con Pianoforte acc. this is actually a quintet. The Clarini are in fact Clarinets, not Trumpets.
This work also exists under the name Quartetto di Concerto in a version for 4 winds and orchestra (manuscript score at Biblioteca di archeologia e storia dell'arte - Roma)
Uploaded image - page 6 of piano score is unreadable.
This piece can also be found at the source of uploader : http://img.kb.dk/ma/ukam/ponchielli_quartetto.pdf