The Freedom of Information Act (FOIA) requires FOIA reading Rooms contain four distinct categories of records. The four categories of Reading Room records are: 1) 'final opinions [and] . . . orders' made in the adjudication of cases; 2) specific agency policy statements; 3) 'administrative staff manuals and instructions to staff that affect a member of the public'; and 4) records disclosed in response to a FOIA request that 'the agency determines have become or are likely to become the subject of subsequent requests for substantially the same records.'