| 21. | After several more years of preparation, which involved garnering various permissions to perform the exhumations, the ground survey began in 1998.
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| 22. | Mapped by United States Geological Survey ( USGS ) from ground surveys and U . S . Navy air photos 1960-63.
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| 23. | An unclassified version of the study, based on data from civilian satellites and airplanes and a ground survey, contains few surprises.
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| 24. | He said a team of engineers from Puncak Niaga and a consultant would conduct ground survey to ascertain the exact details.
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| 25. | Mapped by United States Geological Survey ( USGS ) from ground surveys and U . S . Navy air photos, 1961-67.
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| 26. | Mapped by United States Geological Survey ( USGS ) from ground surveys and U . S . Navy air photos, 1960-62.
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| 27. | A ground survey team discovers a vast subterranean energy network with a power source located some 500 kilometers from the ship.
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| 28. | Mapped by United States Geological Survey ( USGS ) from ground surveys and U . S . Navy air photos, 1960-63.
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| 29. | Officials say counting is a lengthy process of aerial and ground surveys that need to take account of seasonal migration patterns.
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| 30. | The annual census of the species involves aerial and ground surveys and educated estimates based on the number of observed birds.
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