The website Objectif Tintin lets you read Rodiers entire finished version of Herges last unfinished Tintin-adventure at:
This is, in my regard the best version, and the only one available in English. In French you can also find the version of "Ramo Nash"
And the somewhat more crude "Pierre" version:
There is also a version by "ENSBA Paris", but it does not seem to be available online.