Graphics on the IfA Library web site are from:

Treasury of Book Ornament and Decoration:
537 Borders, Frames, and Spot Illustrations from
Early Twentieth Century Italian Sources

(Dover Pictorial Archive Series)

by Carol Belanger Grafton (Editor)

New York: Dover Publications, Inc., 1986

and

Gothic & Medieval Designs: CD-ROM & Book
(Dover Electronic Clip Art)

by Karl Mohrmann and I.F. Eichwede (Editors)

New York: Dover Publications, Inc., 2007