by Paul Barker | .
by Jevons, F.R | .
by C.D Darlington | .
by Bertrand Russell | .
by S.Chandrasekhar.
by Paul Q. Hirst | .
by Eileen Younghusband | .
by W.M. Williams | .
by H.I.Moore | .
by S. H. Glenister | .
by Joseph A. Schumpeter | .
by R. E. Caves | .
by R. A. Leeson | .
by W.P.Seabrook | .
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