Here's a relatively unknown artbook published by Flesk Publication in 2012. It's from the Spectrum series but the publisher is different.

This particular volume features only 5 guest artists, and they are Android Jones, Brom, Iain McCaig, Phil Hale, and Mike Mignola. Illustrious names that don't need much introduction.

It's a hardcover. 64 pages.

The print run is limited to 2000 copies.

It's available on Amazon.com

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Here are direct links to the book:
Amazon.com