These images were scanned from a 1996 book, 'Ornamental Type' from the Pepin Press stable.
The book has almost no commentary other than to advise that the selection of ornamental letters, monograms and initials included were produced from the 15th century up to the 1930s.
Their alphabets and type designs were fairly obviously derived from microfilm scans (some of the original book/manuscript examples - not seen above - have been posted on BibliOdyssey previously). That's not to say it's bad quality particularly, just that it's more intended as a stylistic reference guide or design inspiration rather than being copybook quality. I have cleaned up most of the background noise in the above images (which would be about 10% of what's in the book, if that).
Previously: Ornamental Typography and in general: calligraphy.