<Tr> <Th> Inscription </Th> <Td> 1979 (3rd Session) </Td> </Tr> <Tr> <Td_colspan="2"> Location of Great Pyramid of Giza </Td> </Tr> <Tr> <Td_colspan="2"> Related media on Wikimedia Commons </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr>

When was the limestone removed from the pyramids