A recent arrival at the Internet Archive was this collection of Art Nouveau book decorations by Max Benirschke (1880–1961). Very welcome it is too, although I wish it had been accompanied by its companion volumes from Koloman Moser and Carl Otto Czeschka. The three books formed a series, Die Quelle (The Source), a Viennese equivalent of the design books produced by Alphonse Mucha and others in France. Both the Benirschke and Moser books have been available from Dover Publications at one time or another but the Benirschke one seems now to be out of print. There’s more about Die Quelle and its artists (plus related subjects) at the excellent Vienna Secession. Benirschke’s book may be browsed and downloaded here.