Mark Hess, an artist and a graphic designer, is used to turning out commissioned works - typically magazine covers - in a few days.

Not yet part of the station budget, it might cost as much as $2 billion, said Mark Hess, a NASA spokesman.

Drummer Boy: Marching to the Civil War illustrated by Mark Hess (HarperCollins, 1998)

A spokesman for the F.A.A., Mark Hess, said last week that the agency does not comment on specific terrorist threats.

Designed by Mark Hess of Katonah, New York, the stamps are the second installment of the Classic Collection.

Mark Hess, a NASA spokesman, said the redesign would probably be done by the middle of this month.

Mark Hess, a NASA spokesman, said the cost of building the Endeavour was $1.8 billion.

"Grumman will provide the technical help to the space agency to pull the program together," said Mark Hess, a spokesman for the National Aeronautics and Space Administration.

"We'd love to have a heavy-lift launch vehicle," said Mark Hess, an agency spokesman.

A NASA spokesman, Mark Hess, said the total costs to the United States, including support flights and operating outlays, should be about $24 billion.