Aggregate Industries, Inc.
Allegheny Mineral Corp.
American East Explosives, Inc.
APAC, Inc.
Robert Archibald & Bronwyn Weaver
Austin Powder Co.
Phillip R. and Eleanor D. Berger
Better Materials Corp.
Binkley & Ober, Inc.
W.W. Boxley Company
Capitol Aggregates, Inc.
The Casper Stolle Quarry & Contracting Co.
Castrol Heavy Duty Lubricants, Inc.
Caterpillar, Inc.
Cemex USA
Central Limestone Company, Inc.
Chaney Enterprises
Columbia Steel Casting Co., Inc.
Deister Machine Company, Inc.
Devcon International Corp.
Dolese Bros. Co.
Dyno Nobel Inc.
Eagle Crusher Co., Inc.
Eastern Industries, Inc.
Mr. & Mrs. R. A. Edwards, III
Feltes Sand & Gravel Co.
Florida Rock Industries, Inc.
Franklin Industrial Minerals
The Frazier Quarry, Inc.
Global Stone Corporation
Granite Mountain Quarries
Haines & Kibblehouse, Inc.
Halquist Stone Co., Inc.
Hanson
Hedrick Industries
Huber Engineered Materials
Irving Materials, Inc.
Kinkaid Sierra Stone
Kolberg-Pioneer, Inc.
Komatsu America International Company
Lafarge Corporation
John S. Lane & Son, Inc.
Linwood Mining & Minerals Corp.
Luck Stone Corporation
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Maine Aggregates Association, Inc.
Martin Marietta Materials, Inc.
Maryland Materials, Inc.
Material Service Corp.
McLanahan Corporation
H. B. Mellott Estate, Inc.
Mellott Enterprises, Inc.
Metso Minerals
Michigan Aggregates Corp.
Mineral Information Institute
New Enterprise Stone & Lime Co., Inc.
Ohio Aggregates & Industrial Minerals Association
Oldcastle, Inc., Materials Group
ORICA USA, Inc.
Pennsylvania Aggregates & Concrete Association
Pine Bluff Sand & Gravel Company
Process Machinery, Inc.
R.B.S. Incorporated
Rein, Schultz & Dahl of Illinois, Inc.
Rinker Materials Corporation
The River Products Company
RiverStone Group, Inc.
Rock Industries, Inc.
Rock Products Magazine
Rogers Group, Inc.
Snead Management Systems, Inc.
Specialty Minerals, Inc.
Springfield Underground, Inc.
Stedman Machine Company, Inc.
Tarmac America, Inc.
Telsmith, Inc.
Mark & Doris Towe
TXI
Virginia Aggregates Association
Vulcan Materials Company
Wake Stone Corporation
Wyandot Dolomite, Inc.
York Hill Trap Rock Quarry Co., Inc.
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