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- [5] ReviewofDigitalMappingTechniques:TheIllinoisExperience. RobertJKrumm,CurtisCAbert,DanielONelsonetal. . 1997
- [6] OverviewofNewJerseyGeo-logicalSurveyDigitalDataMethods,MappongattheOregonDepart-mentofGeologyandMineralIndustries. RonaldSPristas,GregoryCHerman. USGeologicalSurveyOpen-FileReport97-269 . 1997
- [7] FielddatacaptureandmanipulationusingGSCFieldogv3.0. Brodaric,Boyan. USGeologicalSurveyOpen-FileReport97-269 . 1997
- [8] TopologicalandThematicLayeringofGeologicalMapInformation:ImprovingEfficiencyofDigitalDataCaptureandMan-agement. DavidViljoen. U.S.GeologicalSurveyOpen-FileReport97-269 . 1997
- [9] GISandDigitalMappingattheSouthDakotaGeologi-calSurvey. TimCowman. USGeologicalSurveyOpen-FileReport97-269 . 1997