|aOriginally published: New York : Playmore : Waldman Pub., 1990.
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|a9-12
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|aProfessor Hardwigg, his nephew Harry, and their guide Hans explore a volcanic crater in Iceland that leads them to the center of the Earth and to incredible and horrifying discoveries.
Professor Hardwigg, his nephew Harry, and their guide Hans explore a volcanic crater in Iceland that leads them to the center of the Earth and to incredible and horrifying discoveries.