The Adobe Photoshop Layers Book

Sometime in early 1993, I was working for a how-to photography
book publisher as an editor/designer. We had Photoshop 2.5
and I used it to make adjustments to scan the images and
illustrations to make them ready for print. Photoshop was fairly
new at the time; it didn’t yet have all of the features that would, not
much later, make it the industry standard in image editing.