https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1987.-pa371-measuring-checking-and-precision-instruments-and-apparatus/455239
Report on the Census of Production for 1987. PA371 Measuring; checking and precision instruments...
https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1986.-pa371-measuring-checking-and-precision-instruments-and-apparatus/453668
Report on the Census of Production for 1986. PA371 Measuring; checking and precision instruments...
https://digital.library.lse.ac.uk/Documents/Detail/report-on-the-census-of-production-for-1989.-pa371-measuring-checking-and-precision-instruments-and-apparatus/457970
Report on the Census of Production for 1989. PA371 Measuring; checking and precision instruments...