In case you want to learn Engineering Electromagnetics, great textbook by William Hayt and John Buck
Haven't yet read any other awesome basic textbook on 'Computer Networks' like the one by Andrew S. Tanenbaum
'Digital Signal Processing' by Oppenheim and Schafer
Although these are not textbooks but among other good reads are 'Crossing the Chasm' by Geoffrey Moore, 'The Innovators Dilema' by C. M. Christensen, give amazing insights.
The Art of Electronics by Horowitz & Hill
Integrated Electronics by Millman and Halkias (There was allegedly a newer edition published in 2001)
Electrical Engineering 101: Everything You Should Have Learned in School... but Probably Didn’t by Darren Ashby
Microelectronic Circuits by Sedra & Smith (Look around for a 4th edition)