William Mook wrote: When will we do it? Now!

We have to reduce the cost of Earth-to-orbit transportation at least
by one order of magnitude before we can debate the practicability of
space colonization. Some useful ideas are posted in my on-line book -
Earth-to-Orbit Transportation Bibliography: http://www.islandone.org/LEOBiblio/

I believe that the first step on the path to space colonization is
robotic fabrication of small, reusable, liquid propellant rocket
modules. You can find more info about these modules in my old book. I
am working on a new rapid fabrication system. If it works, it can
reduce the cost of liquid propellant rocket engines.

Popular Science Apr 1952 has an article about Moon colony:
http://books.google.com/books?id=oiE...colony&f=false

By the way, I have been working on diverse projects: science,
technology, even linguistics. You can find my Ygyde auxlang (auxiliary
language, much better than Esperanto) he http://www.ygyde.neostrada.pl/