The Wikipedia Library has new, free research donations available this month. post 
*Elsevier - science and medicine journals and books *Royal Society of Chemistry - chemistry journals *Pelican Books - ebook monographs *Public Catalogue Foundation - art books
Many other partnerships are still available too...
wikipedia
Accounts are open to ALL global editors with a 1 year old account and 1000 edits. Signups mostly happen on English Wikipedia, UNLESS a local Wikipedia Library branch has been started, like we've done on Arabic, Chinese, and German.
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I haven't got that edit count so I'm not eligible.