https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1992.-pa461-sawmilling-planing-etc.-of-wood/460795
Report on the Census of Production for 1992. PA461 Sawmilling; planing; etc. of wood - LSE Digital...
https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1989.-pa461-sawmilling-planing-etc.-of-wood/503558
Report on the Census of Production for 1989. PA461 Sawmilling; planing; etc. of wood - LSE Digital...