These are the list of books, I found it very useful in my area of work.
Programming
The Art of Computer Programming - Vol.1 by Donald E. Knuth
The Art of Computer Programming - Vol.2 by Donald E. Knuth
The Art of Computer Programming - Vol.3 by Donald E. Knuth
The C Programming Language (2nd Edition) by Brian W. Kernighan, and Dennis Ritchie
C Interfaces and Implementations: Techniques for Creating Reusable Software (Addison-Wesley Professional Computing Series) by David R. Hanson
C: A Reference Manual (5th Edition) by Samuel P. Harbison and Guy L. Steele
Handbook of Data Structures and Applications (Chapman & Hall/Crc Computer and Information Science Series.) by Dinesh P. Mehta and Sartaj Sahni
The Practice of Programming by Brian W. Kernighan and Rob Pike
Unix Network Programming, Vol. 1: The Sockets Networking API, Third Edition by W. Richard Stevens, Bill Fenner, Andrew M. Rudoff
UNIX Network Programming, Volume 2: Interprocess Communications (2nd Edition) by W. Richard Stevens
Advanced Programming in the UNIX(R) Environment (2nd Edition) (Addison-Wesley Professional Computing Series) by W. Richard Stevens and Stephen A. Rago
TCP/IP
W. Richard Stevens
TCP/IP Illustrated, Volume 1 - The Protocols by W. Richard Stevens
TCP/IP Illustrated, Volume 2 - The Implementation by W. Richard Stevens, Gary R. Wright
TCP/IP Illustrated, Volume 3 - TCP for Transactions, HTTP, NNTP, and the UNIX(R) Domain Protocols by W. Richard Stevens
Douglas E. Comer
Internetworking with TCP/IP Vol.I
Internetworking with TCP/IP Vol.II: ANSI C Version: Design, Implementation, and Internals
Internetworking with TCP/IP Vol.III: Client-Server Programming and Applications, Linux/Posix Sockets Version
Andrew S. Tanenbaum
Computer Networks, Fourth Edition
Modern Operating Systems
Operating Systems Design and Implementation (3rd Edition) (Prentice Hall Software Series) by Andrew S Tanenbaum and Albert S Woodhull
Distributed Systems: Principles and Paradigms (2nd Edition) by Andrew S. Tanenbaum and Maarten van Steen
Structured Computer Organization (5th Edition)
Networking
An Engineering Approach to Computer Networking by Srinivasan Keshav
Computer Networking: A Top-Down Approach (4th Edition) by James F. Kurose and Keith W. Ross
Telecommunication
Digital Telephony by John C. Bellamy
Signaling System #7, Fifth Edition, by Travis Russell
Embedded Systems
Embedded Systems Building Blocks: Complete and Ready-to-Use Modules in C by Jean J. Labrosse
MicroC OS II: The Real Time Kernel by Jean J. Labrosse
An Embedded Software Primer by David E. Simon
Embedded Systems Architecture: A Comprehensive Guide for Engineers and Programmers (Embedded Technology) by Tammy Noergaard
Computers as Components: Principles of Embedded Computer Systems Design by Wayne Wolf
SIP
SIP Demystified by Gonzalo Camarillo
Internet Communications Using SIP: Delivering VoIP and Multimedia Services with Session Initiation Protocol (Networking Council) by Henry Sinnreich and Alan B. Johnston
SIP: Understanding the Session Initiation Protocol, Second Edition by Alan B. Johnston
H.323
IP Telephony with H.323: Architectures for Unified Networks and Integrated Services by V. Kumar, Markku Korpi, Senthil Sengodan, and Vineet Kumar
Linux
Linux Kernel Development (2nd Edition) (Novell Press) by Robert Love
Linux Device Drivers, 3rd Edition by Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman
Understanding the Linux Kernel (2nd Edition) by Daniel P. Bovet and Marco Cesati
Building Embedded Linux Systems by Karim Yaghmour
Others
Code Complete, Second Edition by Steve McConnell
Rapid Development by Steve McConnell
Code Reading: The Open Source Perspective by Diomidis Spinellis
Small Memory Software: Patterns for Systems with Limited Memory (Software Patterns Series) by James Noble, Charles Weir, and Duane Bibby
The School of Niklaus Wirth: The Art of Simplicity by László Böszörményi, Jürg Gutknecht, and Gustav Pomberger
Charged Particle Optics
The instrument - The Scanning electron microscope by Charles William Oatley, Cambridge University Press, 1972
Electron Optics by Pierre Grivet
Handbook of Charged Particle Optics by Jon Orloff, CRC 1997
Principles of Electron Optics - Vol.1,2,3 by Peter W. Hawkes and E. Kasper