At one of Gore's main rivals, Associated Air Center in Dallas, the company keeps track of its sales with little flags stuck into a wall-size world map outside its sales office.
The record office said the Raymond Frostick Map Collection included maps where the North Sea is described as the German Ocean - a term often used until World War I - and King's Lynn was called three different names - Linn, Lyn and Lin.
Robert Nash, Glaxo's director of U.S. environment health and safety, previously worked in an enclosed office, decorated with photos and a map of the North Carolina coastline.