While digital scans are easy to find, they exist in a legal grey area. The Giger estate is protective of the artist's intellectual property. High-quality "verified" scans are often technically copyright violations.

The book you might be referring to seems to be:

Lovecraft described his monsters as "indescribable," often relying on vague adjectives to convey horror. Giger, however, achieved the impossible: he visualized the indescribable. The landscapes in Necronomicon are "Lovecraftian" not because they feature tentacles, but because they evoke a sense of alienation . The environments are non-Euclidean, often lacking a horizon line or a center of gravity. The viewer is placed in a vacuum where the laws of physics have been replaced by the laws of a nightmare.