She said he comes across as an intelligent man who had a knack for public relations and was very interested in his public image.

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But she said the tapes also reveal times when the president became bored or annoyed and moments when he used swear words.

The sound of the president's children, Caroline and John Jr., playing outside the Oval Office is part of a recording on which he introduces them to Soviet Foreign Minister Andrei Gromyko.

"Hello, hello," Gromyko says as the children come in, telling their father, "They are very popular in our country."

JFK tells the children, mentioning a dog Soviet Premier Nikita Khrushchev gifted the family: "His chief is the one who sent you Pushinka. You know that? You have the puppies."

JFK Library spokeswoman Rachel Flor said the daughter of the late president has heard many of the recordings, but she wasn't sure if she had heard this batch.

"He'd go from being a president to being a father," Porter said of the recordings. "... And that was really cute."