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\bibitem{VanGrieken_etal1994} {\textquotedblleft}\textit{Effects of air pollution on historic buildings and monuments (1986-1990): scientific basis for conservation: analytical study of the weathering of building stones under field-exposure conditions}{\textquotedblright}. Van Grieken R, Vleugels G, Sweevers E, Dewolfs R, European cultural heritage newsletter on research \textbf{8}, 2 (1994)

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