Ecology: General Ecology and Ecology (3rd Edition)
Fundamentals of Electronic Technology: Fundamentals of Analog Electronic Technology (5th Edition) and Fundamentals of Digital Electronic Technology (6th Edition).
Fundamentals of electrical engineering and heat transfer: heat transfer (5th edition) and electrical parts of power plants (5th edition).
Fundamentals of Veterinary Medicine: Veterinary Clinical Diagnostics (2nd Edition) and Veterinary Pharmacology (4th Edition).
Basic synthesis of mechanical design: C programming (5th edition), industrial design methodology (3rd edition) and mechanical principle (9th edition).