Moon/Mars trade studies?

Anybody have some good links to the all trade studies done by NASA to come
up with the Constellation program. I'm interested in see what options NASA
looked at as far as different scenarios that were studied to come up with
the Lunar part, specifically the economic impact studies wrt how the
current plan helps out our new and budding US manned space flight industry
(space tourism, ...)

I'm just wondering how they chose the Apollo type scenario, and exactly how
it's going to help out a new manned space flight industry in the US?

Or, were the trade studies all done in the early 1960s?
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Craig Fink
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