Also there's no documentation. Real shepherds, shearers, spinners, and knitters don't comment their code^H^H^H information on how any if this is done, so good luck. You'll end up with both a sweater and intact knees if you're hard enough.
Barber, E: Women's Work: The First 20,000 Years : Women, Cloth, and Society in Early Times also links the author to the Friedmans, who are relevant to the history of secret communication: Fagone, Jason: The woman who smashed codes: a true story of love, spies, and the unlikely heroine who outwitted America's enemies

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