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- AeroMetric, Inc.31
- Illinois State Geological Survey15
- Quantum Spatial, Inc. (formerly AeroMetric, Inc.)14
- Surdex Corporation10
- Federal Emergency Management Agency7
- Merrick & Co3
- Indiana Department of Environmental Management, Office of Land Quality2
- Aero-Metric, Inc.1
- Barb Stiff1
- C. P. Weibel S. V. Panno1
- David Duran, GIS Division 1
- Dean Tucker, Water Resource Division1
- Donald A. Keefer, Illinois State Geological Survey1
- Federal Aviation Administration (Aeronautical Information Services, ATA-100)1
- Herzog, B.L.. B.J. Stiff, C.A. Chenoweth, K.L. Warner, J.B. Sievering, C. Avery1
- Illinois State Water Survey1
- Massachusetts. Highway Department1
- National Park Service1
- Quantum Spatial, Inc (formerly AeroMetric, Inc.)1
- Research and Innovative Technology Administration's Bureau of Transporation Statistics (RITA/BTS)1