https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1976.-pa391-hand-tools-and-implements/437433
Report on the Census of Production for 1976. PA391 Hand tools and implements - LSE Digital Library
https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1978.-pa391-hand-tools-and-implements/441244
Report on the Census of Production for 1978. PA391 Hand tools and implements - LSE Digital Library