But if you want a quick video read-through of the book, check out the book's YouTube page. You can also see a ten-part video series on the making of the book, plus more exclusive video content, such as "The Martin Goodman Exhibit" and footage of the New York City Book Release Event on October 12, 2013.
There's a number of avenues where you can grab a sneak peek of the book:
1) 23-page .pdf excerpt, including the introduction and first chapter.
2) Flickr Photo Album, with numerous still shots of the book.
3) "Secret History of Marvel Comics" Facebook Page, with exclusive content.
4) Fantagraphics Home Page for the book.