by R.Lal | .
by E.C. Pielou | .
by Alexender S. Podolsky | .
by Nicholas Polunin | .
by Charles A.S. Hall | John W. Day.
by F.C. Pielou | .
by R. Lal | .
by C.C. Delwiche | .
by Jerome O. Nriagn | .
by Gary W. Barrett | R. Rosenberg.
by A.W.A. Brown | .
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