|Schiaparelli's Notebook (1888)|
|A Map of Barsoom, http://barsoom.wikia.com/wiki/Barsoom|
- T -2: Industrialization*
- E 3: Two garden worlds and one hostile world**
- R 0: Sustainable
- Verdant water world hidden beneath the clouds (Venus/Amtor/Cosoom)
- The Age of Empire - Iron ships and wooden men (Earth/Jasoom)
- A dying desert planet preserved by ancient machines (Mars/Barsoom)
*There are pockets on T-1 technology on Barsoom, such as the radium rifles that are in broad use. Note that the radium here denotes the metallic content of projectiles fired by the rifle.'
**We consider Barsoom to be a hostile world since water is scarce and the atmosphere is maintained only by ancient machines. Earth and Venus are garden worlds.