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T.R. Paton, G.S. Humphreys, P.B. Mitchell
UCL Press 1995
: hbk , : pbk
Available at 5 libraries
edited by A.J. Ringrose-Voase, G.S. Humphreys
Elsevier 1994 Developments in soil science 22
Available at 3 libraries
by R.M. Scott, P.A. Healy and G.S. Humphreys
Institute of Biological Resources, Commonwealth Scientific and Industrial Research Organization Australia 1985 Natural resources series no. 5
: pbk