Secret Origins #6 (1973)

"The Origin of the Legion!," script by E. Nelson Bridwell, art by Pete Costanza.  The origin of the Legion of Super-Heroes is told. Three youths with fantastic powers save billionaire R. J. Brande, who bankrolls them in an organization meant to emulate Superboy and Supergirl: the Legion of Super-Heroes! Reprinted from Superboy #147 (1968).

"The Origin of Blackhawk," script by Will Eisner and Bob Powell, art by Charles Cuidera. The Nazis, led by Captain von Tepp, attack the Polish Air Force, the only obstacle to their victory over Poland.  In this attack, a lone survivor sees his brother and sister killed.  He vows to hunt down von Tepp and make him pay for their deaths; on this day, The Blackhawk was born! Reprinted from Military Comics #1 (1941).

Includes one-page text feature on the origins of the Legion and Blackhawk. Cover by Nick Cardy. Good condition.