by A.W.A. Brown | .
by E.C. Pielou | .
by R.M. Nisbet | W.S.C. Gurney.
by R.H. Pain | B.J. Smith.
by William G. Cochran & Getrude M. Cox | .
by D.A.S. Fraser | .
by Paul A. Herzberg | .
by Karl F. Lagler | .
by J.C. Rankin | .
by Joseph S. Nelson | .
by G. E. Shuliman | .
by D.V. Radakov | .
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