Age determination from the Crossness Sewage Works site, Bexley, London
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资源简介:
Depth relative to Ordinance Datum (OD) http://www.pol.ac.uk/ntslf/tides/datum.html
相对于英国军械测量局基准面(Ordinance Datum,OD)的水深 http://www.pol.ac.uk/ntslf/tides/datum.html



