Phosphatic guano from Sombrero Island, West Indies ; the richest deposit of phosphate of lime known to the world, containing above 80 per cent. of bone phosphate of lime.
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Phosphatic guano from Sombrero Island, West Indies ; the richest deposit of phosphate of lime known to the world, containing above 80 per cent. of bone phosphate of lime.
Phosphatic guano from Sombrero Island, West Indies ; the richest deposit of phosphate of lime known to the world, containing above 80 per cent. of bone phosphate of lime.