Sir: Visitors to Dartmoor would be well advised to study the guidelines issued by the national park authority (report, 27 March).
But walkers' feet are doing far less damage to the moor overall than the combined impact of sheep and military training. Overgrazing is a particularly serious cause of degeneration of heather moorland on Dartmoor - so much so that the Devon Wildlife Trust have been quoted as saying that there will be no significant areas of heather left on the moor in 10 or 20 years' time.
ALAN MATTINGLY
Director
The Ramblers' Association
London SW8
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