Carl Oscar Boije af Gennäs (1849-1923) was an insurance agent as well as an amateur guitarist. His collection includes printed editions from the early 19th century and manuscripts, e.g. autographs by J.K. Mertz.
The collection, which was donated to the library in 1924, consists of guitar music only. It is currently being digitized in the form of pdf files by the Music Library of Sweden.
> Direct link to the Boije Collection's page