- 1W. Clausen-Thue
The A B C Code : Fifth Edition, Improved withThe Verbatim Supplement Code as part IV
New York: American Code Company 1923; 1485 S. : Ill., zahlr. graph. Darst.
Telegraphie; Code - 2Sixth Edition (With Five-Letter Artificial Codewords);
New York: American Code Company; XXVIII, 1400 S. . zahlr. graph. Darst., Kt.
Telegraphie; Code - 3Bentley's Complete Phrase Code
New York: American Code Company - 4Western Union Telegraphic Code : Five-Letter Edition
New York: American Code Company 1917; XXVIII, 1812 S. : zahlr. graph. Darst.
Telegraphie; Code