You can browse for harp scores under these call numbers:

M115-M119: Harp alone:

M115: Collections of pieces by more than one composer

M116: Collections of pieces by one composer

M117: Individual works by one composer

M118: Collections of pieces by one composer arranged for harp

M119: Individual works by one composer arranged for harp

M273: Collections of harp music with piano accompaniment
 

Search the online catalog for further combinations of instruments.