New York ? Furious FDNY members are gearing up for a protest Monday against a book claiming New York’s Bravest looted World Trade Center stores while the twin towers burned.

“We just think that’s a disgusting thing to say,” said Capt. Peter Gorman, head of the Uniformed Fire Officers Assn., which is organizing the rally.

“He’s making a disgrace of all the lives that were lost that day,” said Lee Ielpi, a retired firefighter whose son Jonathan, also a firefighter, was killed in the attacks.

Gorman is urging people to rally outside the South Street Seaport Museum, where William Langewiesche, author of “American Ground: Unbuilding the World Trade Center,” will sign copies of his book – just blocks from Ground Zero.

“We hope he gets the message,” said Gorman, who has sent out letters to 2,500 of his ranks for the protest.

Another protest is planned for Tuesday at another Langewiesche book signing on the upper West Side.

Langewiesche, a correspondent for Atlantic Monthly, was granted unfettered access to the recovery effort at the Trade Center site by city Department of Design and Construction head Kenneth Holden.

In “American Ground,” he accuses firefighters of loading pairs of jeans from a Gap store in the underground mall at the twin towers onto their Ladder 4 rig while the horror of the terror attacks unfolded.

He alleged there were similar incidents, including looting by cops on the scene, in interviews in Atlantic Monthly last summer.

“I’m not naive enough to say there aren’t crooked firefighters, cops, teachers, nurses out there,” Gorman said. “But to think that a firefighter might have told his captain, ‘I’ll go down and take some jeans,’ it’s absurd.”

Ielpi, who spent nine months searching for remains at the site, praised all of the recovery workers and volunteers who gave their time to dig through the twisted rubble.

“To see their names disgraced by this book is a travesty,” he said. “I’m sure the public is going to see through this money-making charade that was orchestrated by a couple of people who had access to the site.”