Lt. Col. Jerry Killian’s secretary says she did not type the CBS documents.

HOUSTON — The former secretary for the Texas Air National Guard colonel who supposedly authored memos critical of President Bush’s Guard service said Tuesday that the documents are fake, but that they reflect real documents that once existed.

Marian Carr Knox, who worked from 1956 to 1979 at Ellington Air Force Base in Houston, said she prided herself on meticulous typing, and the memos first disclosed by CBS News last week were not her work.

“These are not real,” she told The Dallas Morning News after examining copies of the disputed memos for the first time. “They’re not what I typed, and I would have typed them for him.”

Mrs. Knox, 86, who spoke with precise recollection about dates, people and events, said she is not a supporter of Mr. Bush, who she deemed “unfit for office” and “selected, not elected.”

“I remember very vividly when Bush was there and all the yak-yak that was going on about it,” she said.

But, she said, telltale signs of forgery abounded in the four memos, which contained the supposed writings of her ex-boss, Lt. Col. Jerry Killian, who died in 1984.

She said the typeface on the documents did not match either of the two typewriters that she used during her time at the Guard. She identified those machines as a mechanical Olympia, which was replaced by an IBM Selectric in the early 1970s.

She spoke fondly of the Olympia machine, which she said had a key with the “th” superscript character that was the focus of much debate in the CBS memos. Experts have said that the Selectric, and mechanical typewriters such as the Olympia, could not produce proportional spacing, found in the disputed documents.