https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1973.-pa322-copper-brass-and-other-copper-alloys/432683
Report on the Census of Production for 1973. PA322 Copper; brass and other copper alloys - LSE...
https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1987.-pa322-metal-working-machine-tools-and-engineers-tools/454949
Report on the Census of Production for 1987. PA322 Metal-working machine tools and engineers' tools...