In 1997, Glass adapted another of Lessing's books from this series for the opera, The Marriages Between Zones Three, Four and Five.
List of zones of Nepal | Royal Marriages Act 1772 | Iraqi no-fly zones | Gun-Free School Zones Act of 1990 | The Marriages Between Zones Three, Four and Five | Special Economic Zones of the People's Republic of China | Organizational Structure of Jehovah's Witnesses#Branches and zones | Indiana's time zones | European Union wine growing zones | Biogeoclimatic zones of British Columbia |