Search U.S. government technical reports digitized or harvested by TRAIL.
Mining methods of the Fort Dodge Limestone Company, Inc., Fort Dodge, Iowa
Sand and gravel operations and costs, Concrete Materials and Construction Division, Martin Marietta Corp., West Des Moines, Iowa
Mining and beneficiating methods and costs at two crushed- limestone operations, Madison County, Iowa
Sand and gravel operations and costs, Minneapolis-St. Paul area, Minn.