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I  recommend these excellent sites for the following   information:

The Art of Kit Building by WT9W


Winding Toroids - it really isn't that tough! by WT9W!


Desoldering - how to remove a component by WT9W


The Basic Soldering Guide by Alan Winstanley


Calculate Resistor Values from Color Codes


Resistor & Other Component Identification


Capacitor Identification


Inductor Identification


Online Calculators