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	1.	No cover image available Dual rate and DCF techniques of mineral valuation by Hellewell, E.G Series: Land & Minerals Surveying ; 5 (2) February 1987, 76-84 (9)Language: English Publication details: 1987 Availability: Items available for loan: London (1)Collection, call number: ABS37419.
	2.	No cover image available The concept and status of the investment method of mineral valuation by Hellewell, E.G Series: Land & Minerals Surveying ; 4(5) May 1986, 249-251(3)Language: English Publication details: 1986 Availability: Items available for loan: London (1)Collection, call number: ABS36345.
	3.	No cover image available An extended dual rate minerals valuation formula by Hellewell, E.G Series: Land & Minerals Surveying ; 3(7) July 1985, 362-366(5)Language: English Publication details: 1985 Availability: Items available for loan: London (1)Collection, call number: ABS35070.
	4.	No cover image available Valuation of variable future incomes on the dual-rate basis by Hellewell, E.G Series: Chartered Land Surveyor / Chartered Mineral Surveyor ; 2(2) Autumn 1980, 45-51(4)Language: English Publication details: 1980 Availability: Items available for loan: London (1)Collection, call number: ABS27200.
	5.	No cover image available The dual rate mineral valuation principle index-linked by Hellewell, E.G Series: Chartered Land Surveyor / Chartered Mineral Surveyor ; 1(4) Winter 1979, 15-24(6)Language: English Publication details: 1979 Availability: Items available for loan: London (1)Collection, call number: ABS26230.
	6.	No cover image available Mineral valuation - the dual rate principle modified for inflation by Hellewell, E.G Series: Quarry Management ; 3(5) May 1976, 120-122(3)Language: English Publication details: 1976 Availability: Items available for loan: London (1)Collection, call number: ABS20783.