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- Environmental Systems Research Institute (Redlands, Calif.)58
- Geological Survey (U.S.)10
- Environmental Systems Research Institute (Redlands, Calif.), publisher7
- Voyager Company7
- CLEARVUE/eav (Firm)4
- Harpold, Terry4
- Keyboard Publishing4
- Crane, Gregory, 1957-3
- EPA Systems Development Center (U.S.)3
- Environmental Systems Research Institute (Redlands, Calif.), author3
- Environmental Systems Research Institute (Redlands, Calif.), issuing body3
- Trelstad, Robert L.3
- Trimble Navigation Ltd., publisher3
- United States. Environmental Protection Agency3
- Winter, Robert, 1945-3
- Ambroziak, Russell A.2
- Duval, Joseph S.2
- Ellefsen, Karl2
- Northeastern Forest Experiment Station (Radnor, Pa.)2
- Southern Hardwoods Laboratory (Stoneville, Miss.)2