1. It was compiled from satellite, marine, aeromagnetic and ground magnetic surveys . 2. It was discovered by a magnetic survey and a gravity survey. 3. He performed magnetic surveys in Bavaria and northern Germany, France, Spain, and Denmark. 4. Magnetic surveys are extremely useful in the excavation and exploration of underwater archaeological sites.5. In 1901 he began a magnetic survey of South Africa. 6. He was soon promoted to chief of the department's " Land Magnetic Survey " section. 7. Techniques used during this investigation include magnetic survey . 8. He also took part in four eclipse expeditions, and a magnetic survey of the British Isles. 9. The subsurface structure has been studied from a few outliers, boreholes, xenoliths, and gravity and magnetic surveys . 10. In terrestrial archaeology, magnetic surveys are typically used for detailed mapping of archaeological features on known archaeological sites.
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