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由 Siddharth Kumar 提交于
* Fix Contributing.md broken link * Fixed broken links in free-programming-books-pt_BR.md * Removed the broken link There is no other link found, related to the book. * Added vector calculus book
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* Fix Contributing.md broken link * Fixed broken links in free-programming-books-pt_BR.md * Removed the broken link There is no other link found, related to the book. * Added vector calculus book