File:Wigwag Tree Station, Upper Potomac.png
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| current | 14:47, 11 March 2020 |  | 339 × 588 (169 KB) | Spinningspark | {{Information |Description=A wigwag station in a tree on the Upper Potomac. |Source=Albert J. Myer, ''A Manual of Signals'', D. Van Nostrand, 1872 |Date=published 1872 |Author=Albert J. Myer (1828-1880) |other_versions= }} == Licensing == {{PD-old-70}} {{KeepLocal}} |
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