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Oxon 20
| Originator: | Thames Valley LDWA |
| Month: | May |
| Frequency: | Held Annually |
| Distance: | 20¾ miles |
| Ascent: | 2,000 feet |
| Time: | 13 hours |
| Location: | Chiltern Hills |
| Maps: | Explorer 171 |
| Awards: | Badge & Certificate |
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| No. |
Grid Ref. |
Checkpoint |
| Start | SU 760 963 | - |
| Finish | SU 760 964 | - |
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