Global yarn weight conversion chart for US, UK, and Australia
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Yarn Weights Chart - Crochet 365 Knit Too
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Yarn Weight Chart for Crocheting: Ultimate Comprehensive Detailed Guide — Pocket Yarnlings — Pocket Yarnlings
Crochet...Gotta Love It! Blog: Handy Yarn Weight and Hook Size Chart, July 10, 2012
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Yarn Weights and Symbols: A Chart! - moogly
