41. The aerial surveys are not required, he said. 42. Archaeological evidence for these sites is thin and is mostly based on aerial surveys of crop marks. 43. Monteiro said the Tikrit inspection lasted the whole of Saturday and included an aerial survey by helicopter. 44. Photographed from the air by Falkland Islands and Dependencies Aerial Survey Expedition ( FIDASE ) in 1957. 45. One of its first government contracts was an aerial survey of New Mexico to study soil erosion. 46. Shah's comment was based on aerial surveys . 47. The annual state aerial survey counted 3, 261 manatees in 2001, up from 2, 222 in 2000. 48. Indian Navy helicopters were conducting aerial surveys , and navy divers were looking for more bodies or survivors. 49. These were modified by Derby Aviation at Derby ( Burnaston ) Airport for high altitude aerial survey . 50. Monteiro said the Tikrit inspection lasted the whole of Saturday, and included an aerial survey by helicopter.
