Full Title: Opera Postuma (Posthumous Works)

Originally published in 1862, the Opera Postuma was a two-volume publication by the St. Petersburg Academy of Sciences containing all the works of Euler that it had not yet published. Compiled by P. H. Fuss, the volume contained 59 unpublished works of Euler, which Eneström numbered as E792-E799 and E806-E856. Full scans of the Opera Postuma can be found at the Biodiversity Heritage Library online.