The modern service of commercial and railway telegraphy, in theory and practice, arranged in questions and answers. Designed for students and operators.
|Main Author:||Abernethy, John Patterson.|
Cleveland, O., 1883.
2d. 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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