An audit prompted in part by the loss of the Wright Brothers' original patent and maps for atomic bomb missions in Japan finds some of the nation's prized historical documents are in danger of being lost for good.

Nearly 80 percent of U.S. government agencies are at risk of illegally destroying public records and the National Archives is backlogged with hefty volumes of records needing preservation care, the audit by the Government Accountability Office found.

The report by the watchdog arm of Congress, completed this month after a year's work and obtained by The Associated Press, also found many U.S. agencies do not follow proper procedures for disposing of public records.

Officials at the National Archives, which houses the Declaration of Independence, the U.S. Constitution and other treasured documents at its Washington rotunda, had no immediate comment Tuesday on the findings.

The report comes more than a year after news reports of key items missing at the nation's record-keeping agency. Some of the items have been missing for decades but their absence only became widely known in recent years.

The patent file for the Wright Brothers flying machine was last seen in 1980 after passing around multiple Archives offices, the Patents and Trademarks Office and the National Air and Space Museum.

As for maps for the bombs dropped on Hiroshima and Nagasaki, military representatives checked them out in 1962, and they've been missing ever since.

The GAO report did not specifically mention those or other examples of missing items including Civil War telegrams from Abraham Lincoln, Eli Whitney's cotton gin patent and some NASA photographs on the moon.

To read the complete article, see:Audit Shows Records at National Archives in Washington at Risk of being Lost for Good(www.artdaily.org/index.asp?int_sec=2&int_new=42116)