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edited by Dieter Helm
Oxford University Press 1989
: hard
Available at 19 libraries
edited by Dieter Helm, John Kay, and David Thompson
Clarendon Press , Oxford University Press 1989
Available at 9 libraries
selected and with an introduction by Dieter Helm
University of Toronto 1984
Available at 1 libraries
B. Blackwell 1984
: pbk
Available at 71 libraries