Captain Marvel Adventures #73

Even the World's Mightiest Mortal needs a hobby — and this June 1947 Fawcett cover by C. C. Beck finds Captain Marvel in full costume, magnifying glass in hand, carefully examining a rock specimen from a display case stocked with labeled minerals including granite, quartz, and marble. The teaser "Captain Marvel Becomes a Petrophile!" gives the whole scene a wonderfully offbeat charm that sets this issue apart from the usual superhero fare. It's a delightful snapshot of mid-century comics at their most inventive, with Beck's clean, expressive linework making even a geology lesson look genuinely fun.