All music librarians are accustomed to receiving donations of music - the excitement is in the discovery of something rare, useful, or just plain unusual.
A tatty copy of Solos and Duets for Trombones with Pianoforte Accompaniment (Salvation Army Instrumental Albums No.15, dating from 1933) falls into the latter category. Presumably someone just couldn't bear to throw it away.
Separated from its stated pianoforte accompaniment, all we have is the trombone part. It's really not much use to us! But isn't it interesting to speculate where it has been all these years, and where it might have been played?