This data set is an index of the cancelled Bonne (imperial) series of public plans within Western Australia. i.e.: 20, 40, 80, 200, 300, 400, 600, 800 chain and 4, 8 mile scale ranges. The scale is n chains/mile to one inch and the plans are based on the Bonne Modified Conical Projection.

Before 1903, Public Plans of most of the areas covered by this series were drawn on sheets of the C, G, M, N and K collection of plans (see Record Series No. 979).

From 1903, sheets of the 300 Chain cadastral series were used as bases for the Public Plans.

Already in 1910, some of the Public Plans on 300 Chain sheets were cancelled to, and continued on sheets of the 80 Chain series. In the 1970's, the 300 Chain series began to be retired in favour of sheets constructed on the Universal Mercator projection, with sheet lines conforming to the Australian Map Grid.

The sheets are hand coloured and annotated on lithographic bases (app. 68cm x 101cm), linen backed. Later plans are drawn on acetate sheets.

The plans in this series are held at the State Records Office at consignment 4567.