Instruct: Classify Amazon reviews into positive or negative sentiment
Query: concise resource

When you're ten years out of school, and you still reach for a book you used in college, you know its valuable. I reach for Bube as a refresher very frequently. Its not flowery, but it has just enough figures and just enough math and explanation to cover most electronic phenomena. Photoemission, field emission, photoelectric effects, schottky barriers, etc. are covered well enough so that you can tackle a calculation of a particular phenomenon when necessary.