According to the carrier form of literature, it can be divided into handwritten literature, printed literature, microform literature, audio-visual literature and machine-readable literature. According to the depth of literary creation, use and processing, it can be divided into four levels, namely, first-class literature, second-class literature, third-class literature and zero-class literature.
Extended data:
Special documents refer to dissertations, conference documents, patent documents and technical standards. These documents are an important source of information for scientific researchers. Among the 39 units surveyed, 29 units have 2 10 kinds of specialized documents, 230 kinds, 35492 1 volume.
Special documents refer to conference papers, scientific reports, patent documents, standard documents, product samples, etc. Except ordinary books and periodicals. These documents must be the most advanced and cutting-edge literature resources in this discipline, and also represent the highest level at present.
Thematic literature is a very important information source, with distinctive features, extensive content, huge quantity and high reference value, which plays an important role in medical literature retrieval. Based on the teaching practice of literature retrieval course, the author discusses the necessity, feasibility and improvement measures of strengthening the content of special literature retrieval in literature retrieval course.