C Language and Data Structures

1.  C Language Pointers, Structures, and user-defined data structures pdf
2.  C language Learning: pointers, functions, command-line arguments, and IO pdf
3.  Structures, pointers, arbitrary data types, command line arguments pdf

    Microprocessor & Computer Architecture

4.  Microprocessors' Development History, advances, and Parallel Architectures pdf
5.  High-performance Architectures pdf
6.  High performance CPU Architectures pdf

    Compilers

7.  Compilers' theory, tools, and scope pdf 
8.  Advances in Compilers pdf
9.  Code Generation Phase pdf

    Security

10.  Information and Network Security
   (Attacks, Data Encryption, and defense mechanisms pdf
11.  Database security & Privacy pdf

   Algorithms

12.  Graph Algorithms pdf

   Operating System

13.  Unix file system pdf

   AI

14.  State space search in AI pdf

   Mathematics

15.  Queuing Theory pdf
16.  Fourier Transform & its Applications pdf