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https://www.usgs.gov/labs/spectroscopy-lab/usgs-spectral-library?page=213
USGS Spectral Library | U.S. Geological Survey
Researchers at the USGS Spectroscopy Laboratory have measured the spectral reflectance of thousands of materials in the lab and compiled them in the USGS...
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https://www.usgs.gov/programs/usgs-library/tools
Web Tools - USGS Library | U.S. Geological Survey
Collection of USGS Library tools and resources for locating content and information.
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