One of my favourite books as a kid was The Official Handbook of the Marvel Universe Deluxe Edition. It was an encyclopaedia series on every character, accompanied by panels of art from actual issues. It’s so ingrained in my memory that 30 years later when I come across a panel in an old comic that appeared in it, I immediately remember, and love it. Case in point: this one from Amazing Spider-Man #9
used on the Electro entry.