If you go to the website below, you can search the original Nati, Morti and Matrimoni records for Marilana between 1808 and 1865:
http://www.antenati.san.beniculturali.it/v/Archivio+di+Stato...If you go to the webpage below, you can locate Marliana and then search the Matrimoni allegati records for the various documents presented for marriages between 1871 and 1929:
https://familysearch.org/search/collection/1493462Otherwise, you can rent microfilm tapes from the LDS Family History Library for the Nati, Morti and Matrimoni records between 1866 and 1929 (more or less) and have them sent to a local FHL site.
https://familysearch.org/search/catalog/446463Be advised that the records are handwritten in Italian. URLs may change over time. Good luck.