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medline database indexed more than 20,000 international journals and equals to printing index, such as index medicus, index to dental literature and international nursing index, covering thousands of abstracts with detailed content. the more than 25 million entries in medline dates back to 1950, covering themes in all medical sciences, including clinical medication, dental science, education, experiment, medicine, health service and management, nursing, nutrition, pathology, psychiatry, toxicology, and veterinary medication. the database is updated on daily basis.

claseperiodica latin american journal abstract database comprises two parts: clase and periodica, the former of which is an index for latin american journals in social sciences and the humanities, while the latter of which is an index for latin american journals in science and technology. the database provides an index for 710,000 catalogues in more than 2,700 spanish, portuguese, french and english journals, which not only includes information from journals focusing on the pan-american issues but also articles, papers, booklets, conference documents, technology reports, interviews and notes published in latin america and the caribbean sea. data in clase dates back to 1975 and that in periodica dates back to 1978, themes include agricultural science, history, anthropology, law, arts, library and information science, biology, linguistics and literature, chemistry, management and accounting, communications science, medicine, demography, philosophy, economics, physics, education, politics, engineering, psychology, exact sciences, religion, sociology and geoscience. the database is updated every three months.

eric is a guideline of published and unpublished works in education sorted by the american education resources information center, covering several thousand themes in education and offering the most comprehensive catalogue in education. the database contain all non-journal materials published in resources in education and the references of articles published in current index to journals in education, covering almost all materials in terms of education. eric contains more than 1,000 journals and other materials with more than 1.55 million entries, including an eric wordlist and about 240,000 articles can be read for free. themes in this database include adult education, vocational education, education evaluation, disabled and talent education, primary school and children education, higher education, city education, education management, information and technology, linguistics and phonetics, reading and communication, teacher and teacher education. the database is updated on monthly basis.

ebooks electronic books catalogue database contains all the book catalogue information compiled by the oclc members. with more than 20 million catalogue covering all themes and disciplines, the database contains the catalogue information from 1,000 bc to the current times and is updated on daily basis.

worldcat dissertations has collected all the master’s and doctoral dissertations and the publications compiled by the oclc members, covering all disciplines and all themes. the uniqueness of this database is that all the resources come from world top-notch universities, such as harvard university, stanford university, mit, columbia university, duke university, northwest university in the u.s. and cambridge, oxford, imperial college london, insead, the university of paris, the university of berlin and so on. there are more than 1,980 entries and 1 million with free downloading url, which are important reference materials for academic research. the database is updated on daily basis.

worldcat interconnected and integrated catalogue database is the world’s largest catalogue database, including the catalogue entry and stock information of about 20,000 members of oclc. since established in 1971, the stock information has amounted to more than 2.5 billion in 491 languages and the catalogue information has amounted to 380 million, reflecting all the books and other materials from 4,800 bc to the present and the fruits of the knowledge of the human kind in the past 4,000 years. the literature in this database is of various types, including books, manuscripts, maps, websites and internet resources, music scripts, videos, newspapers, journals and magazines, article and documents. the database is updated every ten seconds.

the 2011 edition of the cambridge backtracking database indexed 207 journals, with 131 journals from arts and humanities and 76 from science and technology. among them, 158 journals have currently been indexed in sci/ssci/ahci (jcr 2010), and the index percentage is 76.3% with the backtracking period from 1770 to 1996. the content of arts and humanities comprises 2,331,003 pages (56.5%) and that of natural sciences comprises 1,796,932 pages (43.5%), with the total amount of 4,358,176 pages.

the national science and technology library selectively introduced foreign works backtracking database to make up for the uncovered science and technology resources produced in early times. currently, the database includes springer backtracking database, nature backtracking database, oup backtracking database, iop backtracking database, and turpion backtracking database. the number of journals covered is 1122, divided into 20 categories with the total amount of more than 3 million.

the encyclopedia britannica is suitable for readers of all ages and is divided into three sub-databases: children, teenager, and adult readers, which includes learning materials suitable for children and daily reference materials for adults, making it possible for readers to do research, homework and daily reading according to different needs among the three databases. the public edition of the encyclopedia britannica is divided into three levels from easy to difficult, and readers can shift between different levels according to their english reading abilities.

the public edition of the encyclopedia britannica is update on the daily basis and the website supports portable devices, so that readers can easily log in and read the content on pads or pcs.

the total amount of the data in the public edition of the encyclopedia britannica is 4,000 gb, including 130,000 encyclopedic articles, 9,000 videos and audios, 90,000 pictures, and 24,000 electronic books and original literature.

brief main window, easy to use.

readers can choose the suitable reading level.

divided into children, teenager and adult reader database.

it is connected to more than 300,000 websites recommended by the encyclopedia britannica experts for readers’ further study.

an audio webster’s dictionary inserted.

the map of the world included.

the comparison of countries included.

research tools included.

support the saving and sharing of articles, pictures and videos.

readers can read with the audio track for an article.

windows specifically designed for children.

national geography is the official magazine of the national geography society, which is famous for providing in-depth reports on culture, nature, science, technology and environment. the magazine provides readers with comprehensive and timely articles and legendary photos and maps, and demonstrates the tremendous changes in this planet and the alien world through the lens of personal experience. the magazine offers epic documentary of discovery from the first-person perspective, including the work of hiram bingham (1875-1956) in machu picchu, the innovative research on gorillas by jane goodall (1934-) and the discovery of the titanic by robert ballard and so on.

with direct window, the database offers a comprehensive search for every article, picture and map of this magazine, and provides materials necessary for research staff and the public in all ages.

the database comprises of three modules: the american national geography online library (1888 to 1994, 1995 to present), the national geography: people, animal and the world; the children’s edition of the national geography.

john wiley & sons inc. is an international professional publishing agency with a history of 200 years, which enjoys authority in academic fields such as chemistry, life sciences, medicine and engineering technology. currently, there are more than 1,500 kinds of digital journals on the wiley online library from various disciplines, including chemistry, physics, engineering, agriculture, veteran medicine, food sciences, medicine, nursing, stomatology, life sciences, psychology, business, economics, social sciences, arts, anthropology, and so on. journals from this publishing house are of high quality and are the key references in related field, with more than 1,200 journals indexed in the sciences citation index. the wiley online library provides more than 222 journals with access to the whole issues, including art & applied arts, business, economics, finance & accounting and law & criminology.