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+## There are just information ## 
+
+Content:
+1. Google Scholar
+2. BASE
+3. CORE
+4. Science.gov
+5. Semantic Scholar
+6. Baidu Scholar
+7. RefSeek
+1. Scopus
+2. Web of Science
+3. PubMed
+4. ERIC
+5. IEEE Xplore
+6. ScienceDirect
+7. Directory of Open Access Journals (DOAJ)
+8. JSTOR
+https://www.ebsco.com/
+https://ivypanda.com/blog/1000-open-textbooks-and-learning-resources-for-all-subjects/