From 1968–1971, HMML microfilmed 13,234 manuscripts in the collection of the Austrian National Library. Cataloging is now complete for 1,042 Greek manuscripts that were microfilmed.

Of these, the oldest dated manuscript was copied by Iōannēs Grammatikos in 925. More info: https://hmml.org/collections/news/metadata-for-1-042-greek-manuscripts-from-the-oesterreichische-nationalbibliothek-in-vienna-austria-is-now-available-in-reading-room/