https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1972.-pa363-telegraph-and-telephone-apparatus-and-equipment/431078
Report on the Census of Production for 1972. PA363 Telegraph and telephone apparatus and equipment...
https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1978.-pa363-telegraph-and-tephone-aparatus-and-equipment/441064
Report on the Census of Production for 1978. PA363 Telegraph and tephone aparatus and equipment -...
https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1988.-pa363-cycles-and-motor-cycles/456605
Report on the Census of Production for 1988. PA363 Cycles and motor cycles - LSE Digital Library