A hand-drawn grid map superimposed on a published base map of Australia (no date). The map divides the continent into geographical areas, numbered 3097 to 3556, which correspond to the maps in Tindale's 'World Aeronautical Chart series'. The grid map, along with a brochure published in 1972 by Division of National Mapping, Commonwealth of Australia, serves as a location key to the numbered charts (see also item 338/18/2).