During the first round of processing, from 1999-2001, each file was reviewed and the following record types were discarded: newspaper and magazine clippings without markings; widely-available publications from the federal government, senate, lobbying groups, and political action committees; copies of bills and senate resolutions, unless marked; position papers; empty envelopes; copies and duplicates of materials already in the collection; empty files; and congressional record statements or introductions to amendments and bills.