 Complete the following phrase:  As a result of an accord reached in 1987, the Soviet Government has returned to the National Archives a potpourri of 73-year-old records from the American consulate in Petrograd. The files have 6,250 thin crackling sheets bound with red-white-and-blue twine, containing items like inventories of vodka shipments and coded telegrams about ships carrying military supplies to Murmansk. The archives cover the time when Petrograd, which was then the capital, between the February Revolution, which ousted the imperial family, and the 