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Effective geologic and geotechnical mapping in cities requires abundant subsurface data. Large data resources exist in the records of public agencies in the Twin Cities in the form of engineering test boring logs. An efficient system for acquiring and compiling these data aided by computer was developed and used to compile a number of geotechnical maps and reports on the geology, hydrology, engineering characteristics, and construction materials resources of the area. Much new information was obtained on the subsurface continuity and stratigraphy of complex Quaternary deposits, on the buried rock surface topography, and on the geology of bedrock formations.

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