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Maruzen has provided Japanese ebooks platform specialized academic books.
You can search by titles, authors, and full text. And you can also download the PDF files and print out from each pages.

The number of downloadable pages varies depending on the contents.
Please check the "Print/Save" screen for each content.

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ProQuest Central is the largest research database of ProQuest covering approximately 160 fields such as Humanities and social science, natural science and the medical field.  The collecting data contains not only newspapers and thesis in addition to magazines but also various reports which are indispensable to assist your progressive study. While supporting the general research regardless of the academic field, ProQuest Central enables to offer the information to each user’s needs by keeping its high quality at the same time.

Eighteenth Century Collections Online (ECCO) is a comprehensive online archive of the Eighteenth Century Published in the United Kingdom.

Developed cooperatively with scholars and librarians worldwide, Oxford Bibliographies offers exclusive, authoritative research guides. Combining the best features of an annotated bibliography and a high-level encyclopedia, this cutting-edge resource guides researchers to the best available scholarship across a wide variety of subjects. Oxford Bibliographies is updated regularly, with 50-75 articles added per year to each subject area. Check back for updates and to see what's new. 

With approximately 5,000 titles, this collection takes The Making Of The Modern World series into the early 20th century. Comprised mainly of monographs, reports, correspondence, speeches, and surveys, this collection broadens Gale's international coverage of social, economic, and business history, as well as political science, technology, industrialization and the birth of the modern corporation.

Kyushu University Collections is a comprehensive database of academic contents provided by Kyushu University library, where you can search and access printed books and journals in the university, subscribed and open access e-journals and e-books, Kyushu University Institutional Repository (QIR), digitized images of our rare materials, and more.

WorldCat is the world's largest network of library contents: more than 76 million of bibliographic records and more than 1.1 billion holdings' records. The number of bibliographic records are rising at a rate of 3.2 million records per year.
Materials in WorldCat have a wide variety of formats: books, serials, audio materials, scores, and maps etc. The languages of them are over 400.

KAKEN covers research conducted with grants-in-aid for scientific research provided by Japan's Ministry of Education, Culture, Sports, Science and Technology (MEXT) or the Japan Society for the Promotion of Science (JSPS). It contains records of the data made available at the start of each project (adopted topics), and outlines of the project deliverables (research reports and outlines of deliverables).

Institutional Repositories DataBase (IRDB) is a database that collects and provides metadata of the contents registered in institutional repositories in Japan.