The Origin and Powers of the Legion of Super-Heroes

During the 1960s, DC published three versions of this reference feature, adding pages as the Legion's ranks expanded.

The first version ran 2½ pages in Superman Annual #4 (1960):

In Adventure #316 (1964/Jan), two graphic pages were added, and the text portion expanded to a full page, for a total of 5 pages:

The third version, published in Adventure 365 (1968/Feb), changed Triplicate Girl to Duo Damsel, added two more graphic pages and upped the text to two pages, for a total of 9 pages. The text pages were edited to include characters' real names, and to correct and expand some entires (notably Duo Damsel and the Super-Pets).