On July 20, 1969, President Nixon in the White House spoke to Apollo 11's Neil Armstrong and Buzz Aldrin at Tranquility Base. From the holdings of the Nixon library.
The moon rock that Neil Armstrong and his fellow Apollo 11 astronauts gave the Dutch turns out to be a piece of petrified wood. I'm assuming from the article that the possibility we discovered petrified wood on the moon has been ruled out.
The London Telegraphclaims to have unearthed the draft of the speech President Nixon was to have given in the event Neil Armstrong and Buzz Aldrin had been stranded on the moon in July 1969. But the document has been public for years and on display at the Nixon Library.