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This article mainly introduces what pqdd refers to, the article is very detailed, has a certain reference value, interested friends must read it!

Pqdd is a database for searching doctoral and master's papers, and its full name in English is "ProQuest Digital Dissertations", which represents the digitalized abstract database of doctoral and master's theses. PQDD provides a total of 14 fields for retrieval, including title, abstract, author, tutor, school, discipline, age, language and so on.

PQDD (ProQuest Digital Dissertations), the digitalized abstract database of doctoral and master's theses, is developed by ProQuest Company of the United States. It has collected more than 1.6 million records, covering the first doctoral thesis in the world (USA) which was passed in 1861, and the information of doctoral and master's theses that were passed this semester this year.

In addition to the citations related to each paper, the information of doctoral thesis published after 1980 contains 350-word abstracts written by the author. The information of master's thesis published after 1988 contains 150-word abstracts. More than 55000 new papers are added every year.

For electronic copies of papers published after 1997, users can browse the first 24 pages of these papers free of charge. The database has a full version and two fascicled versions, part An and part B. Series An is mainly the humanities and social sciences version, and Series B is mainly the science and engineering version.

PQDD provides a total of 14 fields for retrieval, including Title, abstract, author, advisor, school, subject, year, language and so on.

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