Please note - there are always 2 sets of parts for the Horn music:
one for French Horns in F, and one for Tenor Horns (Alt Horn) in E flat.
This 2 movement Sonatina was originally written for Piano,
and here is arranged for 2 Trumpets, 2 Horns and Euphonium.
If your available lower instruments are different,
it is easy to transpose new parts to suit what you have.
For example, Trombones could replace the Horn parts.