Here's a gallery of the great Jim Steranko's work on his signature series. You can watch his talent blossom as the covers roll.
Here are some covers for reprints.
Here's a cover for the 80's revival of the series.
Here are the covers to the collections, which I read Steranko is not crazy about.
Here's a closer look at the Marvelmania poster.
Here are a couple of overseas oddities.
And here's a gorgeous original for an iconic SHIELD cover.
And here's a link to a full-blown Steranko SHIELD classic. "Dark Moon Rise, Hell Hound Kill!" is a lush tip of the hat to the awesome Arthur Conan Doyle classic Sherlock Holmes novel The Hound of the Baskervilles.
And finally here's a link to "Who is Scorpio?", the awesome story from SHIELD's debut number. See the tragic tale of Flip Mason. Thanks Joe.
And that's the ever-lovin' end!