Perhaps it is this iPad, but I got only a File Not Found result when using the link sent with the piece on the Wittenborn Memorial Book Award winner. This link does work for me:
http://www.nga.gov/content/ngaweb/research/online-editions/17th-century-dutch-paintings.html
Cheers,
Lee
E. Lee Eltzroth
georgiaphotographers.wordpress.com
@galpix on Twitter
Sent from my iPad