I have a number of older Scandinavian weaving books (and am always looking for more with drafts) and many projects call for 'Lingarn Nr.12' which has me a bit flummoxed. The one I am looking at now calls for 20/2 cotton in the warp and #12 linen yarn in the weft. Another frequently mentioned size is #20. This particular book was published in 1973. Is there any sort of standard for linen or conversion chart around? I'd also welcome suggestions for the linen warp in the project I mentioned. Thanks!