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Publisher
- U.S. Geological Survey,19
- New Hampshire Department of Environmental Services,17
- Geological Survey ;14
- Platts9
- New Hampshire Department of Resources and Economic Development,6
- New Hampshire Geological Survey, NH Department of Environmental Services,4
- State of New Hampshire, Highway Dept.,4
- U.S. Geological Survey ;4
- [New Hampshire Department of Environmental Services],4
- [U.S. Geological Survey],4
- Geological Survey,3
- New Hampshire Dept. of Environmental Services,3
- New Hampshire State Planning and Development Commission and Highway Dept.,3
- New Hampshire State Planning and Development Commission,3
- U. S. Geological Survey,3
- New Hampshire Geological Survey,2
- New Hampshire, Department of Resources and Economic Development,2
- State of New Hampshire Highway Dept.,2
- The Commission,2
- The State Highway Dept.,2