Laying of vitrified clay duct for telegraph, telephone and signal wires. (1200 w.) (No. 59388)
Underground wires on the Panama railroad
Ry Age Gaz
1915
Ills.
Article (Journal)
English
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Engineering Index Backfile | 1902
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Engineering Index Backfile | 1912
|Engineering Index Backfile | 1914
Concerning the Panama railroad
Engineering Index Backfile | 1900
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