[OT] Ironclads and Tanks and Such

Does anyone know of a good online source of pictures of WWI tanks or
Civil
War ironclads?	I'm working on scratchbuilding a steam powered tank for
an
upcoming Colonial game, and I am in dire need of inspiration.  Since
this
is about as off-topic as it comes (unless someone wants to theorize
about a
steampunk supplement for the various GZG games...) it would probably be
best if you e-mail me directly.

Thanks, all!

John X Crimmins
johncrim@voicenet.com
  "...is one of the secret masters of the world: a librarian.
They control information.  Don't ever piss one off."
  --Spider Robinson, The Callahan Touch.