A specialist in Coleoptera he assembled an immense collection comparable with that of Pierre François Marie Auguste Dejean (1780-1845). This is in the Muséum national d'histoire naturelle. Fairmaire wrote 450 scientific papers and other publications relating to Coleoptera (partial list of papers in Wikispecies). He also worked on Hemiptera.
- Works by or about Léon Fairmaire at Internet Archive
- Scarab Workers
- BDH Histoire Naturelle de France Hemipteres Musée Scolaire Deyrolle (1884).Scan