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	1.	Image from Google Jackets	The use of side-scan sonar for hydrographic surveying and the gathering of bottom texture information by Hydrographic Department Series: Professional Paper ; 24 PARTS 1 AND 2 Edition: 2nd ed. Language: English Publication details: Taunton Hydrographic Department 1987 Availability: Items available for loan: London (1)Collection, call number: BASEMENT.
	2.	Image from Google Jackets	The readjustment of the retriangulation of Great Britain, and its relationship to the European Terrestrial and Satellite networks by Ashkenazi, V Cross, P.A Davies, J.K Proctor, D.W Ordnance Survey Series: Professional Paper ; 24Language: English Publication details: Southampton Ordnance Survey 1972 Availability: Items available for loan: London (1)Collection, call number: SHELF 202.
	3.	Image from Google Jackets	The readjustment of the Indian triangulation. by Bomford, G Survey of India Series: Professional Paper ; 28Language: English Publication details: Dehra Dun Survey of India 1939 Availability: Items available for loan: London (1)Collection, call number: SHELF 205.
	4.	Image from Google Jackets	Notes on the application of the method of least squares to the adjustment of triangulation and level and traverse networks by Clendinning, J Yates, F Series: Professional Paper ; 1Language: English Publication details: Accra Gold Coast Survey Department 1929 Availability: Items available for loan: London (1)Collection, call number: SHELF 316.
	5.	Image from Google Jackets	Three sources of errors in precise levelling by Bomford, G Survey of India Series: Survey of India Professional Paper ; No 22Language: English Publication details: Dehra Dun Geodetic Branch Office, Survey of India 1928 Availability: Items available for loan: London (1)Collection, call number: SHELF 205.