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3nork Headland, Robert, 1944-Gaiak “...Tourism Antarctica History Chronology....”
Argitaratua 1992
Liburua -
4nork Headland, Robert, 1944-“...Antarctica Discovery and exploration Chronology....”
Argitaratua 1989
Liburua -
5nork Headland, Robert, 1944-“...Antarctica Discovery and exploration Chronology....”
Argitaratua 2009
Liburua