Available for purchase in Supergirl: The Silver Age Vol. 1 (paperback), Supergirl: The Silver Age Vol. 1 (digital), and Supergirl: The Silver Age Omnibus Vol. 1 (hardcover).
Action Comics #252 – “The Supergirl From Krypton!”
Available for purchase in Supergirl: The Silver Age Vol. 1 (paperback), Supergirl: The Silver Age Vol. 1 (digital), and Supergirl: The Silver Age Omnibus Vol. 1 (hardcover).