1.   Blue-chip companies like International Paper and Weyerhaeuser own huge forest tracts, but their balance sheets are also laden with mills and inventories of finished goods.

2.   Many ecologists say that anyone who is interested in reducing pests in forest tracts and increasing forest productivity should protect the beneficial birds.

3.   One way to protect them is simply to prevent the fragmentation of forest tracts.

4.   Satellite photographs were searched for any forgotten forest tracts.

5.   Whole forest tracts sank.

6.   Small fires, often started by lightening strikes and camp fires, erupt suddenly in huge forest tracts when strong wind bursts accompany typically hot and dry weather.

7.   Small fires erupt suddenly in huge forest tracts when strong wind bursts accompany the hot and dry weather typical of the season.