Maps dating back to the early 1800s have been disappearing from the vaults of the Asiatic Society of Mumbai, The Times of India reports:

Almost nothing remains of the entire set of maps that date back to 1803-04: they depict the expanse of Mumbai (then Bombay) in great detail when the first revenue survey was carried out. Called the Dickinson survey, close to 350 rolls had every part of the city drawn — its street plan, forts, old tanks, buildings. The 200-year-old guardian of these maps has no clue how they slipped through its fingers.

Another 150 maps are missing from another of the Society’s collections.