Harvested page scans from Internet Archive.  These are difficult
works to digitize, similar to almanacs or encyclopedia.

1982 - http://www.archive.org/details/worldfactbook82natiilli
1984 - http://www.archive.org/details/worldfactbook84natiilli
1985 - http://www.archive.org/details/worldfactbook85natiilli
1986 - http://www.archive.org/details/worldfactbook86natiilli
1987 - http://www.archive.org/details/worldfactbook87nati