OS 111947-1982Ordnance Survey: Central Registry: Policy Paper Files (PP Series)
This series consists of a series of policy files on all aspects of the work of the Ordnance Survey: they include minutes and papers from Directors General and other senior staff of the Ordnance Survey. Subjects covered include the quarter-inch and half-inch maps, re-triangulation and major triangulation, research and development, and rights of way. Most of the files cover a long time span.