law: Indian Evidence Act, 1872 
  36. Relevancy of statements in maps, charts and plans 
  Statements of facts in
  
  issue or relevant facts, made in published maps or charts generally offered for
  
  public sale, or in maps or plans made under the authority of 23[the
  
  Central Government or any State Government ], as to matters usually represented
  
  or stated in such maps, charts or plans, are themselves relevant facts.