11.   Each of the four was postmarked at the Trenton, N.J., postal center.

12.   Employees of a Kansas City, North, postal center were expected back at work today after the final tests for anthrax proved negative and the center was cleaned.

13.   Even if it did, he said, the two positive anthrax tests were from areas deep inside the postal center, far away from any opening.

14.   E-Stamp and Stamps.com have agreements with America Online to provide e-postage for a postal center AOL is expected to launch this year.

15.   For now, those employees and people who visited the postal center recently are advised to continue taking antibiotics as a precaution.

16.   Gary Stone, manager of the postal center, said he hoped to have his employees back at work next week.

17.   He learned that a worker at the Brentwood Road postal center in Washington, Leroy Richmond, had been tentatively diagnosed with inhalation anthrax.

18.   In addition to the six devices, those people said that at least one more, apparently destined for the newspaper, was found in a suburban postal center.

19.   In addition, other samples were taken by Hunt Midwest, the landlord of the SubTropolis underground office complex that houses the postal center.

20.   Public fear has grown with successive reports of anthrax infections among workers at postal centers, government offices and media outlets.