 
Telegraph
- Telegraph - International Traffic
Hans Buiter / Monika Krompiec / Robert Moeschl
1860,
1870,
1880,
1890a,
1890b,
1900,
1910,
1920,
1930
- Telegraph - International vs. Domestic Traffic
Hans Buiter / Monika Krompiec /Robert Moeschl
1870,
1880,
1890,
1900,
1910,
1920,
1930
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