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Instead of manual searching, you can install specialized browser extensions that automatically detect if a free version of a paywalled paper exists elsewhere.

: Similar to Unpaywall, it searches for OA versions and, if none are found, can help you contact the author to request a copy. download journal paper for free

: Operated by the National Institutes of Health (NIH), PMC is a massive, free archive of biomedical and life sciences literature. Instead of manual searching, you can install specialized