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I use the following book. It has some good concept overviews,
example netlists, etc. It also has a command reference in the
back. Note that I usually write my spice netlists by hand, if you
use a graphical spice, there might be better books. This book
does refer to the graphical spice, but there is little that is specific
SPICE: A Guide to Circuit Simulation and Analysis Using PSpice