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Description and preliminary map of airborne electromagnetic survey of parts of Iron, Baraga, and Dickinson Counties, Michigan
William D. Heran, Bruce D. Smith
1980, Open-File Report 80-297
The data presented herein is from an airborne electromagnetic INPUT* survey conducted by Geoterrex Limited of Canada for the U.S. Geological Survey. The survey area is located in the central part of the Upper Peninsula of Michigan, within parts of Iron, Baraga, and Dickinson Counties. The general area covered is...
Preliminary free-air gravity map, Norton Basin, Alaska
Michael A. Fisher, P.H. McClellan, M.L. Holmes, J.R. Childs
1980, Open-File Report 80-1068
Gravity data shown here were measured with LaCoste and Romberg sea gravimeter S-53 mounted on a 3 axis inertial platform (LaCoste and others, 1967, Valiant and LaCoste, 1976). Primary navigation was by satellite, integrated with course and speed measurements from doppler sonar and gyrocompass. Gravity data were filtered prior to...
Preliminary map showing availability of water from glacial-drift aquifers in McHenry County, north-central North Dakota
P.G. Randich
1980, Open-File Report 80-562
This preliminary map is the first product of the ground-water resources study of McHenry County.  This study is part of a statewide program to determine the location, extent, chemical quality, and hydrologic characteristics of the ground-water reservoirs (aquifers) in North Dakota.  The study was made by the U.S. Geological Survey in...