No definitions found for 'upper frequencies'
Perhaps one of these:
upper paleolithic,
upper fruitland, nm,
upper avon river,
upper pharyngeals,
upper avon,
upper brookville,
upper black eddy,
upper providence township,
upper bench,
upprop,
upper fruitland,
upriver,
upper berth,
upper peninsula,
upper bound,
upper brookville, ny,
upper balcony,
upper falls,
upper volta,
upperville,
upper providence township, pa