by Elsimar M. Coutinho | .
by A Specialist.
by L.F.Curtis | .
by Norman E. Hickin | .
by George H. Carpenter | .
by R. J. Roberts | .
by Archie Carr | .
by O. W. Richards | .
by Robert F. Goldberger | .
by Gordon Haskell | .
by D. J. Bell | B. M. Freeman.
by Sir Vincent | .
by Konrad Lorenz | .
by Edward A. Steinhaus | .
by I.W.Moomaw | .
by E . C . Branson | .
by James Beament | .
by Douglas Dorward | .
by Brian Lofts | .
by C. R. W. Spedding | .
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