User-agent: *
Disallow: /viewer/
Disallow: /books/etc/20172/

User-agent: Googlebot-Image
Disallow: /images/obsolete/
Disallow: /images/contents/
Disallow: /images/common/

User-agent: Yahoo-MMCrawler
Disallow: /images/obsolete/
Disallow: /images/contents/
Disallow: /images/common/

User-agent: psbot
Disallow: /images/obsolete/
Disallow: /images/contents/
Disallow: /images/common/