https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1992.-pa245-working-of-stone-and-other-non-metallic-minerals/459907
Report on the Census of Production for 1992. PA245 Working of stone and other non-metallic minerals...
https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1987.-pa245-working-of-stone-and-other-non-metallic-minerals/454723
Report on the Census of Production for 1987. PA245 Working of stone and other non-metallic minerals...
https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1981.-pa245-working-of-stone-and-other-non-metallic-minerals/445894
Report on the Census of Production for 1981. PA245 Working of stone and other non-metallic minerals...