Section 390(a) in Police Regulations, Bengal , 1943
(a)Vandyked copies of thana maps, scale 1 inch to the mile, issued by the Director of Land Records and Surveys, shall be used as crime maps in all police-stations other than town stations, for which town or municipal maps are to be used. A new map shall be used each year. For this purpose the jurisdiction vandyked maps for 5 years' use shall be supplied to each police-station. They shall be attached to slips of paper placed inside the binding of two card-board covers and entitled "Crime Maps". There will thus be a series of crime maps indicating, as each year is filled up, the crime of the police-station during each of a number of years.
