diff --git a/books/free-programming-books-subjects.md b/books/free-programming-books-subjects.md
index 9252e8425..0dfe34624 100644
--- a/books/free-programming-books-subjects.md
+++ b/books/free-programming-books-subjects.md
@@ -535,6 +535,7 @@ Books that cover a specific programming language can be found in the  [BY PROGRA
 ### Mathematics For Computer Science
 
 * [A Mathematical Theory of Communication](https://archive.org/details/bstj27-4-623) - Claude E.Shannon
+* [Combinatorial Problems And Exercises (1979)](https://archive.org/details/in.ernet.dli.2015.141538/) - L. Lovasz *(:card_file_box: archived)*
 * [Discrete Structures for Computer Science: Counting, Recursion, and Probability](http://cglab.ca/~michiel/DiscreteStructures/) - Michiel Smid
 * [Exploring Math for Programmers and Data Scientists](https://freecontent.manning.com/free-ebook-exploring-math-for-programmers-and-data-scientists/) - Paul Orland
 * [Isomorphism -- Mathematics of Programming](https://github.com/liuxinyu95/unplugged) - Larry LIU Xinyu