West Central Surveying & Mapping, Inc. - Stuart, IA

Zambrana Engineering, Inc. - St. Louis, MO

Ehrhart, Griffin & Associates - Omaha, NE

Martin & Whitacre Surveyors & Engineers, Inc. - Muscatine, IA

Kess & Associates, Inc. - Waterloo, IA

Wilsey & Associates - Sioux Falls, SD