Correct Artwork

Alright, I'm a bit miffed and it's kinda late at night so this may not be my most articulate or level-headed post ever, but...

I'm using iTunes 9.0.2. When I try to auto-import artwork for music from CDs I have ripped, it seems hit-or-miss whether I'll get the correct one. Out of 41 albums I currently have (granted, several of them are local/indie/obscure and have good excuses for not having artwork available), twelve don't have any artwork (as per above, I'm only upset about three of those: Beatles "Revolver," Beatles "Abbey Road," and Joni Mitchel "Clouds"), ten consistently download the wrong artwork (one of 'em has an artist I don't even recognize), and three of them are actually the same album, but for some reason have become separated in iTunes' sorting of them.

Deleting the wrong artwork is tedious, as I seem to be forced to delete it from each song individually, and cannot delete it from an album as a whole.

Is there A) a way to manually find artwork to make sure it's the right one, B) automatically remove artwork when it's all one album, or C) manually assign songs from the same album so that they appear as the same album?