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The sample of diatomaceous earth upon which the observationshave been made,was send to me some time ago by Drs.C.C.Young andP.Teilhard de Chardin of the Geological Survey of China.This is the
The sample of diatomaceous earth upon which the observationshave been made, was sent to me some time ago by Drs.C.C.Young and P.Teilhard de Chardin of the Geological Survey of China.This is the