Title 19, Code of Federal Regulations.
Some CFR bibliomancy for you:
(Number of Grams Per Square Meter)
That is how to calculate the average yarn number for your invoice for cotton fabrics classifiable under headings 5208-5212 of the Harmonized Tariff Schedule of the United States. (See 19 CFR 141. 89(a)).
You are now INFORMED.
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