Six National Geographic Millennium In Maps Series, 1998-99, Population, Biodiversity. Dawn of Humans February 1997. Population October 1998. Cultures June 1999. Biodiversity February 1999. Milky Way August 1999. Exploration February 1998 is the only one of these maps with an identified flaw, there is a small fold tear as seen in photo. These maps belonged to my elderly neighbors and have been stored unused, in a smoke free environment all these years. All double sided maps that measure 31”x 20”. Interesting info and photography. Maps are fragile and caution should be used in unfolding by letting the map gently relax. Please view my other listings for more maps.