Aldabra field notebook of Dr S Trudgill, 'ALD FN/4, P.H. Tit[ration]s' Notes from the Royal Society Aldabra expedition. Notebook of titration results and calculations from P[asse] H[oureau], Aldabra. Includes measurements of salinity and pH. With sketch map and report on Middle Island. Labelled on front board 'ALD FN/4, P.H'. Stamped on innerfront board: 'University of Bristol Soils Laboratory Geography Department'. 1969