Publication
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Laacher See in trefpunten Article
Gea, 10(1), 21-27.January 1977
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Literatuur Article
Gea, 10(1), 28-28.January 1977
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Ordovicische riffen in Dalarna, Zweden Article
Gea, 10(2), 29-33.January 1977
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De Miller-indices van kristalvlakken Article
Gea, 10(2), 34-38.January 1977
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Bouwplaten voor kristalmodellen Article
Gea, 10(2), 38-39.January 1977
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Openbaar stenenbezit - Museum Freriks, Winterswijk Article
Gea, 10(2), 39-39.January 1977
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Leergang petrologie Article
Gea, 10(2), 40-40.January 1977 -
Langzaam draaiende diamantzaag Article
Gea, 10(2), 41-45.January 1977