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De Gruyter books
This open access database provides access to e-books and scientific journals in the social sciences, humanities and STEM.
Digital Commons Network
It is full-text scientific journal articles, book chapters, dissertations, conference papers in the following fields of science: architecture, art, business, education, engineering, law, health.
Directory of Open Access Books (DOAB)
The primary aim of DOAB is to increase discoverability of Open Access books. 
Directory of Open Access Journals (DOAJ)
DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.
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