[arethuza]

There is also the book length "The Case for Mars" by the same author:

http://en.wikipedia.org/wiki/The_Case_for_Mars

[I've had a romantic obsession with the colonization of Mars ever since I read the KSR Mars Trilogy]

[Udo]

Also worth mentioning is the Mars Underground documentary, detailing Zubrin's work and mission over the years:

https://www.youtube.com/watch?v=tcTZvNLL0-w