The Trump administration is closing NASA’s largest research library on Friday, a facility that houses tens of thousands of books, documents and journals — many of them not digitized or available anywhere else.

Jacob Richmond, a NASA spokesman, said the agency would review the library holdings over the next 60 days and some material would be stored in a government warehouse while the rest would be tossed away.

“This process is an established method that is used by federal agencies to properly dispose of federally owned property,” Mr. Richmond said.

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