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By Lynda K. Skipper, Philip J.A. Skipper. She has a PGCE in higher education teaching and is a Fellow of the Higher Education Academy. She researches historic interiors and stone biodeterioration.Philip J. A. Skipper is a research associate and associate lecturer at the University of Lincoln.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.