61.   Burri worked in series, creating abstract collages using ordinary materials.

62.   Builders kept the cost down by using recycled materials.

63.   But faster chips can be made by using other materials, such as an alloy called gallium arsenide.

64.   But for the most part, Las Vegas is a magnet for specialists in decorative effects, often using materials that are light, cheap and synthetic.

65.   But its glass-and-plastic composite materials are used in snow skis, HUM-V vehicles, baseball bats, Stealth bombers and even telephone poles.

66.   But Lanier said he would have used the material in his mayoral campaign if he had known about it.

67.   But Judge Frank Coffin pressed for more detail on this point, asking if the authors kept the final decision about what material to use.

68.   But nowhere are attacks on the quality of environmental education more forceful than in their denunciation of some of the most widely used teaching materials.

69.   But the material is being used commercially on a small scale.

70.   Chiron stopped using material from German cows in September, said Thomas Schick, a Chiron spokesman, after American regulators visited its factory.