| moonmarsworkshop.com | MoonMarsWorkshop: 2004 Site |
| unt.edu | President's Commission on Moon, Mars, and Beyond |
| usra.edu | 35th Lunar and Planetary Science Conference |
| nasa.gov | Space Mission Challenges for Information Technology |
| explorerswanted.com | Space Generation Congress - Vancouver 2004 |
| cbpf.br | 67th Annual Meeting of the Meteoritical Society : Metsoc2004.org |
| iias.nl | International Institute for Asian Studies |
| esa.nl | Esa Conferences, Symposia And Workshops |
| moonmars.org | MOONMARS Workshop IAC Bremen 2003 |
| arcor.de | Dr. Goehlich's Online Space Tourism Lecture |
Japan , ,