| 31. | The first person to draw a map of Mars that displayed terrain features was the Dutch astronomer Christiaan Huygens.
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| 32. | The all-weather missiles navigate by following pre-set terrain features or by satellites that guide the missile to its target.
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| 33. | In military operations, the image was split in two parts, one showing fixed terrain features, the other spotting moving targets.
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| 34. | The first person to draw a map of Mars that displayed any terrain features was the Dutch astronomer Christiaan Huygens.
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| 35. | This second line contained fewer man-made fortifications, but the Japanese took maximum advantage of natural caves and other terrain features.
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| 36. | During the flight to the target the accuracy of the system has to be enough only to avoid terrain features.
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| 37. | There are various settings including jungle, snow and desert, some with unique terrain features and vehicles such as igloos and snowmobiles.
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| 38. | Wherever possible, the Germans took advantage of terrain features such as streams, ravines and gullies but the positions were thinly held.
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| 39. | The two main terrain features holding up the Rainbow division's advance were hills : Hill 288 and the C�te de Ch�tillon.
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| 40. | The first two miles consist of undulating woodland terrain featuring obstacles such as tunnels, pipes, wading pools and an underwater culvert.
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