The Library of Congress recently issued a 78-page document called "The Library of Congress National Recording Preservation Plan" whose purpose is to ensure that our descendants will be able to listen to the sounds of the past long after we're dead and gone.

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The Twitter archive might be its biggest and most challenging effort, but it's not the first time the Library of Congress has sought to document the digital world.

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Since 2000, the library has been collecting pages from websites that document government information and activity.

CNN: Library of Congress digs into 170 billion tweets

The document will be displayed in Pennsylvania until 2017, then at the library until 2020.

WSJ: Truce Ends Tussle Over Bill of Rights

He widely explained basic set of principles and recommendations for the establishment of policies and procedures of library and archive collections with the master plan that every document must be protected at all times from all sort of damage and with the recognition that these collections, as documentary heritage, must be transmitted to future generations.

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The British Library estimates that it costs half as much to store a digital document as it does a physical one.

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"I thought it made so much more sense and so did the New York Public Library that we reach an agreement for Pennsylvania and New York to share a document that we all share, " Mr. Harmelin said.

WSJ: Truce Ends Tussle Over Bill of Rights

While no clear-cut answer has emerged as to the document's rightful owner, the pact ends five years of discussions between Pennsylvania and the library and closes the door on a legal fight.

WSJ: Truce Ends Tussle Over Bill of Rights

On Wednesday, the state and the library are expected to call a truce after agreeing to share custody of the 223-year-old document for the next century, at which point the agreement must be renegotiated or extended.

WSJ: Truce Ends Tussle Over Bill of Rights