| Back | Main Details | Samples & Images | Quarries | Usage | References |
| Books | Journal Articles | Websites |
| Lawson J. B. (1985) | ||
|---|---|---|
| Harnage Slates and other Roofing Materials in Shrewsbury and Neighbourhood in the Late Medieval and Early Modern Period. | ||
| Journal: Transactions of the Shropshire Archaeological and Historical Society, Vol 6, pp 116 - 118. | ||
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