Justice League of America #173

Cover art by Dick Dillin and Dick Giordano for "The Testing of a Hero!" in which the JLA take on the Regulator (story continues in #174). Plotted by Ross Andru and written by Gerry Conway with art by Dick Dillin and inks by Frank McLaughlin. Features heroes this issue: Superman, Flash, Green Lantern, Green Arrow, Zatanna, and Black Lightning.