A B C D E F G H I K L M N O P Q R S T U V W X Y Z     Digital Dissertations (ProQuest Central) UNIC With more than two million entries, the Dissertation Abstracts is the single, authoritative source for information about doctoral dissertations and master’s theses. The database represents the work of authors from over 1,000 graduate schools and universities. Every year around 47,000 new dissertations and 12,000 new theses are added to the collection. This also includes Proquest Dissertation & Theses: A&I. This has more than 2.4 million entries, the ProQuest Dissertations & Theses (PQDT) database is the most comprehensive collection of dissertations and theses in the world. Proquest's UMI Dissertation Publishing group publishes more than 65,000 new dissertations and theses each year, with weekly updates to the PQDT database. Over 930 000 dissertations are available in PDF format, and most include free twenty-four page previews.     DOAJ : Directory of Open Access Journals DOAJ the most comprehensive directory of open access journals, is produced by the University of Lund Libraries. It currently offers access to 2,125 titles and nearly 91,000 articles. More than a quarter of the journals included are searchable at the article level. Subject coverage of the journals includes all areas – multidisciplinary, arts, humanities, social sciences, physical and life sciences, engineering and technology. DOAJ aims to be a one-stop experience for those seeking information through open sources. Aiming at comprehensible coverage, it is a model for expanding the “visibility and ease of use of open access scientific and scholarly journals thereby promoting their increased usage and impact”. The definitions and selection criteria that support open access for the purposes of DOAJ include journals that practice peer review. DOAJ is important for scholars as an indexing tool and as a directory of the expanding number of journals being released as open access.