page.rb seaches for divs that are not in the current HTML of factbook such as:
         [ @opts[:fields] ? 'Introduction'       : 'intro',   '<div id="CollapsiblePanel1_Intro"'  ],
         [ @opts[:fields] ? 'Geography'          : 'geo',     '<div id="CollapsiblePanel1_Geo"'    ],
         [ @opts[:fields] ? 'People and Society' : 'people',  '<div id="CollapsiblePanel1_People"' ],
         [ @opts[:fields] ? 'Government'         : 'govt',    '<div id="CollapsiblePanel1_Govt"'   ],
         [ @opts[:fields] ? 'Economy'            : 'econ',    '<div id="CollapsiblePanel1_Econ"'   ],
         [ @opts[:fields] ? 'Energy'             : 'energy',  '<div id="CollapsiblePanel1_Energy"' ],
         [ @opts[:fields] ? 'Communications'     : 'comm',    '<div id="CollapsiblePanel1_Comm"'   ],
         [ @opts[:fields] ? 'Transportation'     : 'trans',   '<div id="CollapsiblePanel1_Trans"'  ],
         [ @opts[:fields] ? 'Military'           : 'military', '<div id="CollapsiblePanel1_Military"'],
         [ @opts[:fields] ? 'Transnational Issues': 'issues',  '<div id="CollapsiblePanel1_Issues"' ]
So the resulting data is always empty.