I found what I think is a typo in the Woodelves age of the Knowledge Tree. The Steel Manufactory is labeled as Dwarven instead of Woodelves. I also saw the error repeated in the Wiki.
This is actually intended: within the Dwarven Chapter, the Dwarves give their own spin to the Steel Manufactories (as each guest race does with one of the Manufactory types), which continues in later chapters, such as the Woodelves chapter.