Mineral Resources On-Line Spatial Data
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The USGS had an aerial survey flown over parts of Cameron, Hidalgo, and Willacy Counties in Texas. The aerial survey included measurements of the earth's magnetic field and of the radioactivity of the surface rocks and soils.
Metadata as [FGDC] - [XML] - [ISO]
USGS Publications Warehouse [Citation page] - [MODS XML]