Buenas dias architecad: I sympathize with you, but you listed three scources -->
1. Books
2. Archaeological works
3. Archive
Basically I agree, but how do these three units receive their data and artifacts? Through field recoveries of course. and who instigates those recoveries? Initially, private enterprise naturally, since all govt's are very frugal in advancing any serious amounts of money for what is considered treasure hunting. If you personally invest any money into any research program, you rightly expect a profit, or you do not invest, so it is with salvage and research companies, .it is that simple.
No ability to recover at a profit, after a long and very expensive search, means no searching. The various govt's have shown no inclination to invest in their history either, particularly Spain, except for lawyers... So where is the incentive to continue to look for other wrecks? Admittedly as time goes by, newer methods and equipment will make it easier in the distant future, but time is constantly destroying whatever archaeological value most wrecks may have. Those of recent sinkings are well known in all details so are not important to culture study as such..
So, an older, important wreck is located. The Archaeologists then record all pertinent data, etc., fine. There now remains the question of the contents. Why can't the salvage group that expended huge quantities of money and time searching for it now profit? Just how many duplicates of coins, etc., are needed for Archaeological purposes? Let the remainder go to help the company continue to look for more wrecks, and signal a go ahead for others. Remember, the profits from this will then be heavily taxed, again a plus effect..
So in total it is far more logical and archaeologically effective to encourage controlled marine salvage. no?
Even the Marine Archaeologists, who presently are trying to kill the goose that lays "their" golden eggs, will benefit through having more opportunities for employment.
Don Jose de La Mancha