I believe the next level of understanding is achieved when you read some well written articles about the scene at the time, which include journalistic analysis, hindsight retrospectives, as well as interviews from the band members themselves and other bands doing the same thing or influenced by them in some way.
I guess I believe the best way to find out which albums influenced other artists is to ask them. Unfortunately, not all artists particularly like to give interviews, nor do they like to give away the keys to the kingdom so to speak.
For example:
or Precious Metal: Decibel Presents the Stories Behind 25 Extreme Metal Masterpieces
http://www.amazon.com/Precious-Metal-De ... 406&sr=1-3