Whitestone, Ind.; Davenport, Iowa

50,001 to 75,000 Hours-U.S. Americast Concrete Products

Ashland, Chesapeake, Va.

Cayuga Concrete Pipe (Oldcastle)

Croydon, Pa.

Cretex Concrete Products Midwest Inc.

Cedar Rapids, Iowa; Waukesha, Wis.

Hanson Pipe & Precast

Birmingham (Fayette), Ala.

Rinker Materials Concrete Pipe Div.