Pluto and Lowell Observatory: A History of Discovery at Flagstaff Kevin Schindler, Will Grundy
Percival Lowell
- Lowell Observatory Kevin Schindler
- Mensen op Mars: relaas van een manmoedige poging Joris van Casteren
- Mars and Its Mystery: What the Telescope Showed of the Canals Edward Sylvester Morse
- La otra Tierra: Marte como utopía Daniele Porretta
- Houston, abbiamo un problema Lorenzo Colombo, Matteo Miluzio, Filippo Bonaventura
- Is Mars Habitable? Alfred Russel Wallace
- Is Mars Habitable? Alfred Russel Wallace
