Challengers of the Unknown (vol. 1) #13 (Apr.-May 1960):
“Mercury -- The smallest planet in the solar system...”

Challengers of the Unknown (vol. 1) #13

Title: “Mercury -- The smallest planet in the solar system...”

Feature: Solar System Sizes!

Medium: comic

Cover date: Apr.-May 1960

Publisher:

Number of Pages: 0.5

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