[SOC] Component substitution info

[Tom McCulloch]

Quite some time ago I had a book which provided a listing of components 
which could reasonably be used as substitutes for other components.  I think 
it was put out by Radio Shack, for their own line of components.

In other words, if you were building something which called for example to 
use a 2N2222 and you didn't have one on hand, this book would tell you which 
transistors were similar and you could probably get away with using.

Does anyone know if any such book, or perhaps a web site, exists nowadays 
and if so I'd appreciate your pointing me to it.

Thanks for any help you might be able to send this way.

Tom
WB2QDG