Usus Antiquior was the sole academic journal dedicated to the study of the Classical Roman Rite (a dedication that was interpreted quite broadly). However, after only six issues in three years (2010 - 2012) it ceased publication at the end of last year.
With the journal ceasing publication, all of the articles in its six issues are now marked as "free content", and can now be freely downloaded or read online as PDF files. (Previously, only selected articles were available online for free.)
(Note: Rorate does not necessarily endorse everything that was published in this journal.)