The Devilman Roman-Album was a book released by Toei featureing several segments and a comic based on the 1972 anime series.
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The first part of the book features a short comic based on the origonal manga series, useing the designs of the anime for its central characters, several demons from the manga also appear.
The next segment has a breif overview of all 39 episodes and the Mazinger Z vs. Devilman film.
The final segment of the book contains a large amount of concept artwork for a deal of primary characters and several of the demons also.