Section 1251(d) in Police Regulations, Bengal , 1943
(d)An accurate plan of all lands in occupation by the department should be kept, drawn on the scale of 64 inches = one mile, that is 1¼ chains = one inch. The plans should be drawn on tracing paper and kept in a portfolio separate from the register. On each plan shall be shown some permanent or semi-permanent marks, such as trees, roads, tanks, and masonry pillars, etc., to enable the land to be identified. One plan for each group only is needed; plans of buildings are not necessary.
