A preliminary review of nuclear documents turned over to the United States by North Korea shows they appear to be a complete accounting of their plutonium production, the Associated Press has learned. An early study of some 18,000 documents the North Koreans handed over last week indicates North Korea kept its word in providing full details of their plutonium program dating back to 1986, senior State Department officials said Tuesday. The official cautioned, though, that a final assessment is not done and that experts are still pouring through the files. "It looks like all the production records from the period," one official said. "The initial assessment is that it looks pretty good, that they have pretty much given us what they said they were going to give us."