http://ads.ahds.ac.uk/catalogue/adsdata/cbaresrep/pdf/040/04002001.pdf

http://www.bahs.org.uk/32n1a2.pdf

Medieval Horned & Polled Sheep: The Archaeological & Iconographic Evidence

The Productivity of Medieval Sheep on the Great Estates 1100-1500

Sheep farming in Saxon and medieval England (Wool Education Society. Lectures)

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