Gerken Paving, Inc.
Gerken Materials, Inc.
Gerken Leasing Company, LTD
Roadway Services, Inc.
The Custar Stone Company
Bluffton Paving, Inc.
The Bluffton Stone Company
The West Millgrove Stone Company
Hillsdale Sand & Gravel
Glacial Sand & Stone
Round Lake Sand & Gravel
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Gerken Paving, Inc.
Gerken Materials, Inc.
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