| 11. | Amirkhizi said he based his figures on ground surveys conducted by U . N . workers.
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| 12. | Despite a history of heart problems, he nevertheless conducted an on-ground survey of the fire site.
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| 13. | Ground surveys are performed by a mapper, on foot, bicycle, or in a car, motorcycle or boat.
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| 14. | It was first roughly plotted from ground surveys and aerial photographs by the Byrd Antarctic Expedition, 1928-30.
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| 15. | It was mapped by United States Geological Survey ( USGS ) from ground surveys and Navy air photos.
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| 16. | The first work in 1977 was a ground survey and the 1980 investigation consisted of excavations on site.
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| 17. | Population trends have been measured through springtime Breeding Bird Surveys and, in the northern breeding range, springtime singing-ground surveys.
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| 18. | Because of the rugged terrain, the United Nations used not only helicopter overflights by technical experts but also ground surveys.
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| 19. | Burma's " forecast of opium production is based on actual ground surveys, whereas American surveys are based on satellite images.
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| 20. | Mapped by United States Geological Survey ( USGS ) from ground surveys and U . S . Navy air photos, 1959-71.
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