OM wrote:

...IIRC, the plan called for two Titan II launches - one with a
Gemini, one with an uprated Centaur with an ADTA on the end. The
Gemini would dock with the Centaur, and Pete Conrad and whoever got
lucky enough to tag along would get shot backwards into a Circumlunar
trajectory.


There were some variants on the plan, I think they use both Titan II and
Titan III, as well as Saturn I
This one uses two Titan III transtages:
http://www.astronautix.com/craft/lunemini.htm
The one at the bottom of these three is interesting- a Gemini on a
Centaur, and a minimalist LEM on a Agena:
http://www.astronautix.com/graphics/g/geml640.gif

Pat