World War 1 - Sound Ranging
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1. 1st Ranging Section RE Calais 19 April 1915 |  |
2. 11 Nov 1918 Sound Trace 2 |  |
3. Firing Over Open Sights |  |
4. Flash Spotter - Innes |
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5. Flash Spotter Cartoon - Innes |  |
6. Flash Spotters & Sound Rangers Conference Bapaume 1917 |  |
7. Nov 11 1918 Sound Trace |  |
8. Salmon,Hemming and Monet |
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9. Sound Ranging Equipment - Nolan |  |
10. Sound Ranging Graphs 1 |  |
11. Sound Ranging Graphs 2 |  |
12. South OP - Innes |
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13. Survey Post diagram - Innes |  |
14. Tina OP - Innes | ||||