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R. L means a reduced level of and surface this is the elevation distance from mean sea level to surface point where we are finding Reduced level so msl is the universal bench mark for any R. L Read more about Surveying
R. L means a reduced level of and surface this is the elevation distance from mean sea level to surface point where we are finding Reduced level so msl is the universal bench mark for any R. L
Read more about Surveying
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