Quoted from the site:
Publisher: Department of Classics, Princeton University
The Princeton/Stanford Working Papers in Classics is a collaborative project of the Classics Department of Princeton University and the Classics Department of Stanford University. Its purpose is to make the results of current research undertaken by members of Princeton and Stanford Universities in the field of classics available in advance of final publication.
Working Papers are pre-publication versions of academic articles, book chapters, or reviews. Papers posted on this site are in progress, under submission, or in press and forthcoming elsewhere. Although, as far as we know, this is the first Working Papers series in the field of Classics, such series are very common in other academic disciplines.
Is this really as unique as they make out? Sounds a familiar concept, but then I may just be thinking of the many individual scholars who do this sort of thing with their own papers…