| 1. | Mapped by USGS from ground surveys and USN air photos, 1959 65.
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| 2. | In the 1970s, many new deposits were discovered by aerial and ground surveys.
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| 3. | Bulgarian mapping from a ground survey accomplished during the austral summer of 1995-96.
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| 4. | The speed and precision of the system was far superior to traditional ground surveys.
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| 5. | This used satellite imagery, with ground survey used for checking.
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| 6. | First mapped from ground surveys and air photos by the Byrd Antarctic Expedition, 1928-30.
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| 7. | Four areas were excavated based on the ground survey and traces of a basalt wall.
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| 8. | Aerial photography, another mapping option, would cost five times that, ground survey crews even more.
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| 9. | Mapped by USGS from ground surveys and U . S . Navy air photos, 1959-66.
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| 10. | Readjustments must be made from careful ground surveys.
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