Here's my favorite library so far, for any subject you care to name.
https://archive.org/search.php?query=metallurgy&and%5B%5D=mediatype%3A%22movies%22&and%5B%5D=mediatype%3A%22texts%22&and%5B%5D=mediatype%3A%22collection%22&page=3
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upvoted! and with much joy and happiness. (i nearly fell over myself at the size of the collection)
It's the greatest resource I've ever seen, and that's not even counting The Wayback Machine on the main page. If I don't watch myself I can spend days there and never come up for air.
it's true... the knowledge contained in that resource page is massive!. really it's great! I cant thank you enough!