Seminal Graphic Design Books?

Can anyone suggest some solid books
on graphic design / typography?
I’ve done some web/graphic design work and agree that
hands-on practice is key, but I’m hankering
for a little more structure and theory to push
my experimenting in the right direction.

Milton Glaser “Art is Work”

If you want a great resource for benchmarking (a lot of pretty pictures, no theory) I would recommend going to Amazon and do a search on Graphis. Any of there books will have world-class examples of design work.