"It's as different as building a custom home is from building one in a tract development," he said.

There is also evidence that o,p'-DDT disrupts female reproductive tract development, impairing eggshell quality later.

KB Home specializes in the type of suburban tract development that the New Urbanist movement opposes.

They were simply coordinated tract developments with, at most, trees planted in the parkways.

In tract development, elements of the style were frequently used as a variation in post-war row housing in San Francisco's Sunset District.

The town is in transition from farming to suburban tract development.

There's the reservoir and all the houses are built - there won't be any tract developments.

Before tract development, beginning in the early 1970s, Lawrenceville was broadly defined as stretching two to three blocks back from Route 206.

The trees in this suburban tract development were small and sticklike in the anemic sunlight.

"All we saw were treeless tract developments with vinyl siding, not the kind of houses where you'd want to put a candle in the window at Christmas," she said.