text: from readers import readers
  
  """
  Example 1: read a single file from the USGS Spectral Library Version 7 Data.
  """
  spec = readers.ReaderUSGS()
  print(spec.__doc__)
  files = {
      'Reflectance': 'samples/usgs/Actinolite.txt',
      'bandpass': 'samples/usgs/Bandpass.txt',
      'wavelength': 'samples/usgs/Wavelength.txt'
  }
  usgs_record = spec.read_usgs(files=files)
  
  print(usgs_record['data'])
  