https://commons.wikimedia.org/wiki/File:1450_Fra_Angelico_Last_
Judgement_anagoria.JPG, public domain.
All paper used by Open Book Publishers is SFI (Sustainable
Paradiso I; Inferno II, Purgatorio II, Paradiso II, etc.) next to each other Date 2016 Source OpenBook Publishers Author George Corbett and Heather Webb