It took Commerce nearly four weeks to prepare the letter, which was dated Dec. 31.
The request, which was dated May 19 , 2005 arrived several weeks later.
Excerpts of the letter, which was dated Aug. 4, were first reported on Sunday by Reuters.
Mr. Khan produced several of the mailings, the most recent of which was dated Oct. 23.
The paper appeared in issue 7 of vol- ume 9 of the Physikalische Zeitschrift, which was dated 1 April 1908.
A friend who had experience with a P.T.A. newsletter designed and printed the first issue, which was dated June 1987.
Topping the lot was Francis Bacon's "Three Studies of Isabel Rawsthorne," which was dated 1966 and made £11.28 million.
"All this, of course, is perception," Mr. Blair wrote in the memo, which was dated April 29.
No further specifics were given in the letter, which was dated Monday and posted on the company's Web site.
Hennessy was sure of the timing: he had bought a watch in Dubai and kept the receipt, which was dated.
"The occupational disability program provides critical protection for rail workers and their families," said the letter, which was dated Thursday.
