Numismatic selections from Scientific American: 1882. New Coin Scale, 2/4; The World's Production of Precious Metals - The Work of the Mint, 12/2 (No. 361).
Numismatic selections from Scientific American: 1878. A Reliable Test Gold and Silver Coin, 6/8; Counterfeit Coin, 6/15; A New Bank Note Paper Wanted, 11/23.
