The modern service of commercial and railway telegraphy, in theory and practice, including the railway station and express service, arranged in questions and answers.
|Main Author:||Abernethy, John Patterson.|
St. Louis, Mo., The author, 1894.
8th ed., rev. and enl.
> Operators' manuals.
1st edition pub. under title: An outline of commercial and railway telegraphy, in theory and practice ... 1882.
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