Albertus Seba’s Cabinet of Natural Curiosities- the biggest book in history, or at least the GREY office. From this picture it’s hard to tell how big this book actually is. Let’s put it this way, it weighs at least ten pounds. It’s heavier than a really fat cat. It wouldn’t fit in a backpack. It could kill someone if it landed on their head. A tree had to be cut down for every single page. Amazon.com classifies the book as being “jumbo.”