Our hobby is believed to produce more books, journals and periodicals than any other. The PLR, published quarterly and available by subscription, is one of the few journals concentrating on the publication of philatelic material. In addition to reporting on recent library acquisitions, the PLR provides reviews of books, catalogues and research papers. Ongoing features include publishing updates from new releases and research, to literature awards, and news of worldwide philatelic libraries. The Clearinghouse" is a regular feature where readers list literature they want to buy or sell.