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i need any sort of online website or source.. pdfs and such... just help
Serious googling is ur friend. I have over a billion downloaded books.
sometimes u can find used textbooks for v cheap too
Best site for epub/mobi i've found : https://forum.mobilism.org/viewforum.php?f=398
I used Google Scholar at uni.
Go on gen.lib.rus.ec or b-ok.xyz
Lol