That is a matter of public record in Puerto Rico. All copies are available for a fee. Due diligence. Go to San Juan looking like an American Senator, go into the courthouse and pay the monies to get all the info you want. Of course you need to know how to read Spanish and how to ask for the right documents. Lost to the citizens is the understanding of how to really do business(law).
What documents? Why the reluctance to provide any clear details or sources? Where do you have this knowledge from? A book would be easier to start with than impersonating a senator and going to Puerto Rico. Are you trying to inform or dissemble?
There is no book other than Admiralty Law and Black's Law Dict. No one said impersonate. I said look like one. That means be an old white man. See the difference? Reluctance? You don't understand what the Public Record is? I can only point to the direction. The knowledge comes from follow the money. The knowledge is in the Public Record. You can't access documents from the US. How is none of these details clear to you?