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Swiss Yarn Foundation
Organization for individuals and companies, aiming to promote information exchange, education and training for mill employees. Detailed history of the Swiss textile industry. English, German and French. (infos)Fibers & Yarns
From the US Customs Service (September 1996). Publication on the construction and classification of fibers and yarns under the harmonized system. Detailed technical definitions and specifications. (infos)
Yarn Calculator
Universal yarn number equivalent calculator. From Service Thread Manufacturing Co. (infos)