Phosphates of America

Where And How They Occur; How They Are Mined; And What They Cost. With Practical Treatises On The Manufacture Of Sulphuric Acid, Acid Phosphate, Phosphoric Acid... » 

Where And How They Occur; How They Are Mined; And What They Cost. With Practical Treatises On The Manufacture Of Sulphuric Acid, Acid Phosphate, Phosphoric Acid, And Concentrated Super-Phosphates, And Selected Methods Of Chemica «