SAN FRANCISCO (AP) _ FBI agents who searched the home of former Navy radioman Jerry Whitworth found a classified document dealing with wartime contingency plans, an agent testified Wednesday at Whitworth's espionage trial.

The ''Annex K'' document, which Whitworth is accused of stealing for the benefit of the Soviet Union, was found tucked in a folder in a filing cabinet during a second search of Whitworth's trailer home in Davis on May 31, three days before his arrest, agent Phillip Newpher testified.

Fifteen to 20 agents spent about eight hours combing the contents of the trailer and carted out pounds of documents and newspaper clippings, Newpher said.

Also Wednesday, prosecutors placed in evidence two tiny Minox cameras known as tools of the trade that allegedly were seized from Whitworth and a ''Dear Johnnie'' letter found in Whitworth's computer to confessed spymaster John Walker.

''It appeared Mr. Whitworth was working on it when we walked in the first time,'' Newpher said of the letter.

A box introduced as evidence Wednesday contained 39 computer disks from Whitworth's personal computer. Assistant U.S. Attorney Leida Schoggen did not immediately reveal what was on the disks, but the prosecution's opening statement said it would disclose copies of letters Walker enclosed with classified information he dropped in the woods for Soviet agents.

Evidence introduced Tuesday included a camera tripod and lights.

Whitworth, 46, is accused of being the chief supplier of classified Navy information for Walker's massive spy ring and is charged with 13 counts of espionage, seven of which carry potential life sentences.

The government's catalogue of items found in Whitworth's house showed that they will depend heavily on Walker's testimony to offer incriminating interpretations of the items.

Walker received two concurrent life sentences in a plea bargain struck in October.

Ms. Schoggen said Walker was expected to take the witness stand Monday. It would be the first time he has told in public the story of his 17 years as a spy for the Soviet Union.

Other members of the Walker family spy ring, his son, Michael, and his brother, Arthur, also are expected to testify. Also on the witness list is the woman who turned them in to the FBI, Walker's wife, Barbara.

On Wednesday, U.S. District Judge John Vukasin refused to accept as evidence such items as Whitworth's address book, which contained Walker's phone number. He said there was no doubt that the two men knew each other.

Ms. Schoggen also tried to enter a number of plane ticket and hotel receipts for Whitworth's wife, Brenda Reis, who apparently joined him on visits to Hong Kong and the Philippines.

The prosecutor said the receipts would corroborate Walker's expected testimony that he met with Whitworth in those locations to receive classified information.

The judge delayed ruling on the evidence.

Whitworth, who was a Navy buddy of Walker's, says he is innocent of all charges and is being implicated by Walker, who is attempting to win leniency from the government.