What causes the smell of new and old books?

Infographic [1] created by Andy Brunning/Compound Interest licenced under CC:BY-NC-ND 4.0 [2]

[1] http://www.compoundchem.com/2014/06/01/newoldbooksmell/

[2] http://creativecommons.org/licenses/by-nc-nd/4.0/

http://www.compoundchem.com/2014/06/01/newoldbooksmell/ https://bonn.social/media/Sm4-1vEJfx9QyPQHpB8