For those who don't yet know there is a plug in for Chrome called UnPaywall that lets you find the #OpenAccess versions of #Academic #Research when they exist.
Honestly it is totally worth it even if you are with an institution b/c it is faster than logging into a library etc.
https://unpaywall.org/products/extension
Unpaywall

Totally legal versions. It just finds them wherever they live.
If the person added them to a website or research portfolio etc. the extension shows you the source