Exceptionally detailed large format map of London from the beginning of the 20th century.
The map was published by prolific Edinburgh mapmaker John Bartholomew, presumably sometime around 1939, given the hand-written date in the upper-left corner.
The map was evidently used to train fire brigades in navigating the city, which is famously difficult.
Almost all streets are named. Major public buildings are illustrated. Postal codes are delineated.