Board Thread:Wiki/@comment-27441457-20160627051627

While glancing through the Attack on Titan Guidebook recently, I noticed something pretty surprising in the "White Paper" section (a big in-universe infodump about the military) that I'd completely forgotten about.

In the section of the White Papers detailing the equipment and technology of the Survey Corps, the Papers describe some technologies that are mentioned only in the Before the Fall spinoffs: iceburst stone and iron bamboo. While not specifically mentioning events and peoples from Before the Fall, the details do line up with what's described in Before the Fall.

Since the Attack on Titan Guidebook was written and illustrated by Hajime Isayama himself, the White Papers included (as far as I know), it's a completely canon source. Isayama must have drawn these two elements from Before the Fall and approved of them, including them alongside Vertical Maneuvering Equipment and ultrahard steel, his own original concepts.

Basically what I'm getting at is, how does this detail affect the canonicity of Before the Fall on the Attack on Titan Wiki? Would this be enough to consider Before the Fall canon, whether it's the novels or the manga? 