Reference book (Great Britain. Ministry of Agriculture, Fisheries and Food)
H.M. Stationery Off
Marion R. Cooper and Anthony W. Johnson
Her Majesty's Stationary Office 1984 Reference book (Great Britain. Ministry of Agriculture, Fisheries and Food) 161
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organised by the Agricultural Development and Advisory Service, April 1977
H.M. Stationery Off. 1980 Reference book (Great Britain. Ministry of Agriculture, Fisheries and Food) 326
pbk.
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