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KENNEDY SPACE CENTER, FLA. -- A member of the Columbia Restoration Project Team places a piece of debris on the floor of the RLV Hangar at KSC. A fourth shipment of Columbia debris has arrived at KSC. The team is examining pieces and attempting to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia as it returned to Earth on mission STS-107. To date, four shipments have arrived from Barksdale AFB, Shreveport, La., the collection point for debris.