I have found that having access to the right information saves me a lot of time and confusion. I have studied many EE textbooks in an academic environment and I can say that for the purposes of an amateur researcher they are overloaded in theory and lacking in practical information.
My favorite source is Practical Electronics for Inventors. This book tells explains the things you need to know in an intuitive way and gives detailed information on the types of components that are available.
The Manual of Free Energy Devices was published in 1987 and it contains one of the best summaries of alt-sci efforts in the past century. Everything from Searl to Tesla to Edwin Gray is in here. You can download this for free off scribd.com.
If you are interested in learning some interesting and unusual applications of electronics then you might like the Analog Circuits Cookbook.
Resonance and oscillators are the most commonly applied concepts in scalar research. The Practical Oscillator Handbook discusses many different types of resonance including crystals, transmission lines, magnetostriction, and active components.
Quite often I find myself building my own custom transformers and inductors out of ferrite cores. The Ferromagnetic Core Design and Application Handbook is quite useful in teaching this black art.
If you are doing with with Ferroresonance and topics like saturable cores or hysterisys then you might like Introduction to Magnetism and Magnetic Materials.