Libri di cipher and telegraph codes

O codigo electrico telegraphico universal e commercial

Secure Digital Communications

Addresses at the inauguration of Charles William Eliot as president of Harvard college, Tuesday, October 19, 1869

Telegraphic cipher code, especially adapted to the cotton trade ..

McNeill's code

American bankers and brokers telegraphic code

M. E. C.

The scientific dial primer

The Secret Corresponding Vocabulary: Adapted for Use to Morse's Electro-magnetic Telegraph ...

Commercial-rating reference book and mercantile, law and bank directory