The library or "dugout" was added to the house in 1909 (Red Roof was built in 1902). The rooms, which consist of the main library and two small rooms on either side of a short hallway that leads from the house, are meant to be fireproof. The walls were cinder block, the shelves metal, and the roof terra cotta. I estimate that there were approximately five thousand books in the house with shelves of various design in almost every room not just the dugout. History, philosophy, economics, politics, literature, money and monetary issues, and art all were to be found on the shelves giving an insight to the mental scope of APA. The above photo is courtesy of Axel Jansen taken May 2007.
Above are before and after photos the top photo taken in 2010 and the bottom taken in 2012. I plan on posting more about the dugout and APA's book collection and even hope to post a partial inventory.