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1, Open Access Library (OALib)

Link: -ki.net/

Websites that are similar to HowNet pages but completely different from iData are free websites (limited in number). You can directly search for keywords and then download/preview them online.

4. The origin of the library

Link: /scihub/

This is a magical website, you can download documents for free, and you can download PDF format for free! Almost all Daniel who do scientific research know this hard-core platform.