Update README.md

Author: OJB-Quantum

README.md

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 "Being good or great at mathematics is a matter of practice. Isolating a term in a complex mathematical formula is like untangling a knot, it requires persistence & loosening of things". - O.J.B.
 
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+### Free Mathematics Textbooks Resources: 
+- [Mathematics Its Contents Methods And Meaning Vol 1, 2, & 3](https://archive.org/details/MathematicsItsContentsMethodsAndMeaningVol3/Mathematics-%20its%20contents%20methods%20and%20meaning%20Vol%201/page/n221/mode/2up)
+- [Mathematical Handbook - Higher Mathematics](https://archive.org/details/vygodsky-mathematical-handbook-higher-mathematics-mir/mode/2up)
+- [Abel’s Theorem in Problems and Solutions](https://www.maths.ed.ac.uk/~v1ranick/papers/abel.pdf)
+- [Elementary Topology](https://www.math.kth.se/math/GRU/2008.2009/SF2721/olegviro.pdf)
+- [Ordinary Differential Equations](https://cosmathclub.wordpress.com/wp-content/uploads/2014/10/morris-tenenbaum-harry-pollard-ordinary-differential-equations-copy.pdf)
+- [Mathematics Library on Internet Archive](https://archive.org/search?query=publisher%3A%22Mir+Publishers%22&and[]=subject%3A%22mathematics%22)
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 ### In Case You Want Some Fun Open Access Interactive Tools to Try:
 - [Free Education](https://ojb-quantum.github.io/Free-Education)