Plate 6:
John Wilcock performing pH measurement of water samples with the B.D.H. Lovibond Nessleriser (1/125 sec, f16).
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Oxford University Cave ClubCave Research Group publication 141961 Oxford University Expedition to Northern Spain |
1961 Expedition Report (CRG 14) Figures |
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Plate 6: John Wilcock performing pH measurement of water samples with the B.D.H. Lovibond Nessleriser (1/125 sec, f16). . |