code: def getSearchUrl(self, album, artist):
      
      # build request url
      params = collections.OrderedDict()
      params["gbv"] = "2"
      params["q"] = "\"%s\" \"%s\" front cover" % (artist, album)
      if abs(self.target_size - 500) < 300:
        params["tbs"] = "isz:m"
      elif self.target_size > 800:
        params["tbs"] = "isz:l"
  
      return __class__.assembleUrl(__class__.BASE_URL, params)
docs: See CoverSource.getSearchUrl.