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PubMed Central. The full text archive for publically funded research by NIH. Has coverage different than PubMed.
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PubMed. Use the "free full text" filter after you search.
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Directory of Open access journals. DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals. All DOAJ services are free of charge including being indexed. All data is freely available.
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Free Medical journals. Has pharmacy and pharmacology topic section.
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Install the UnPaywall extension to find open access article while searching journals themselves.
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Similarly, find or request open access articles through the Open Access button.
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Can request individual articles via public library.