Paris: Auguste Leduc et Cie., n.d.
Public Domain [tag/del]
The original part is damaged by moisture, with a lot of stains. So these scans are low quality, though still readable.
||3 Sonatas for Violin and Cello
||Violin and Cello
2nd line is a cello line (not a figured "continuous bass" (basso continuo) but rather an actual, though accompanying, cello line, not something to build something more on.)