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Small airports, big security hassles
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8th February 2012 | 08:34
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handsfree
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EGNX country
Oh well, here goes :-
256 mm diameter : Boulder
64 to 256 mm dia : Cobble
4 to 64 mm dia : Pebble
2 to 4 mm dia : Gravel
1/16 to 2 mm dia : Sand
1/256 to 1/16 mm : Silt
1/256 : Clay
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