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What kind of volcanite the rock-hewn churches of the Lalibela UNESCO's world heritage site are made of?

open access: yesJournal of Cultural Heritage, 2011
Abstract The extraordinary monumental complex of the 11 rock-hewn churches of Lalibela, included in the UNESCO's world heritage list since 1978, attracted the attention of the conservation science community mainly for their severe chemical weathering, physical decay and structural instability.
Alberto Renzulli   +2 more
exaly   +5 more sources

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