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For those of you who are interested in the details of what is and was going on in the negotiation process between the Bolivian government and the companies exploring, refining and commercializing the Bolivian natural gas, here is an interesting link. In it you will find all the original contracts, as they are right now, in PDF format. I say as they are, because they might change in the near future. They are being re-negotiated again.
They are in Spanish, but I assume that those who really want to read the contracts, do read some or a lot of Spanish.
I wish you lots of fun. :-)