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	1.	Image from Google Jackets	Stonecleaning of granite buildings by Young, Maureen Cameron, Sonja Urquhart, Dennis Historic Scotland Series: Technical Advice Note ; 9Language: English Publication details: Edinburgh Historic Scotland 1997 Availability: Items available for loan: London (1)Collection, call number: F690.241 YOU.
	2.	Image from Google Jackets	Biological growths on sandstone buildings: control and treatment by Urquhart, Dennis Young, Maureen Cameron, Sonja Walkefield, Rachael Historic Scotland Masonry Conservation Research Group Series: Technical Advice Note ; 10Language: English Publication details: Edinburgh Historic Scotland 1997 Availability: Items available for loan: London (1)Collection, call number: F690.24 URQ.

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