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USGS Spectral Library Version 7 contains spectra measured with laboratory, field, and airborne spectrometers covering wavelengths from 0.2 to 200 microns. It includes samples of specific minerals, plants, chemical compounds, man-made materials, and physically-constructed mixtures. The data release is accompanied by a detailed publication describing the instruments, metadata, and possible artifacts in the spectral measurements.
License is listed as 'notspecified'; users should verify terms of use. Data is provided in XML and ASCII text formats, requiring appropriate tools for parsing. The related publication (Kokaly and others, 2017) is critical for understanding instrument characteristics and potential artifacts.