I wondered whether you know anything about 'interstitial pdfs'. We've had these pointed out to us in various links:
The Scarlet Mile: A Social History of Prostitution in Kalgoorlie ...
File Format: PDF/Adobe Acrobat - View as HTML
Horse and Rider in Australian Legend by Nanette Mantle. Carlton: The Miegunyah Press,. 2004, pp. 307, $49.95 hardback, ISBN: 0 522 85089 8. ...
ras/article/viewPDFInterstitial/385/407 - Similar pages
There's an additional complication in the example above: the url points to another article at the journal, in fact there's no article on the social history of prositution in this journal.
I'm not sure what causes this. Do you have any ideas?