This issue has variants.
Special 148 page 500th issue.
Inside front cover. Table of contents.
Nelson goes over the history of Adventure Comics and its predecessor titles, New Comics and New Adventure Comics. He covers several of the features that were a part of it, including Federal Men, Nadir, Sandman, Hourman, Starman, Manhunter, Superboy, Green Arrow, Johnny Quick, Aquaman, Legion of Super-Heroes, Congorilla, Tales of the Bizarro World, Supergirl, Black Orchid, Justice Society, a new Starman, and Dial H for Hero (among others). Includes six cover reprints from the series. (This sequence added 2008-09-07 by Allen Ross, replacing 6 cover reprint sequences.)
Inside back cover.
Back cover. Illustration and promo for stories in the issue. Art is mirror-image of front cover, with the positions of the "classic" and "modern" Legionnaires switched.