Bilaketaren emaitzak - "Petroglyphs"
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The search fro Tassili frescoes the story of the prehistoric rock-paintings of the Sahara
Argitaratua 1959Liburua -
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Angano petroglyphs. IN Looking back [column]
Argitaratua izan da Philippine Daily Inquirer (1999)Artikulua -
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Preserving the ancient rock art of Angono
Argitaratua izan da Philippine Daily Inquirer (1997)Artikulua -
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