url(r'^book/(?P<slug>[^/]+)/html$', 'book_html', name="catalogue_book_html"),
url(r'^book/(?P<slug>[^/]+)/epub$', 'book_epub', name="catalogue_book_epub"),
url(r'^book/(?P<slug>[^/]+)/pdf$', 'book_pdf', name="catalogue_book_pdf"),
url(r'^book/(?P<slug>[^/]+)/html$', 'book_html', name="catalogue_book_html"),
url(r'^book/(?P<slug>[^/]+)/epub$', 'book_epub', name="catalogue_book_epub"),
url(r'^book/(?P<slug>[^/]+)/pdf$', 'book_pdf', name="catalogue_book_pdf"),