by Eugene P. Odum | .
by R.J. Mcilroy | .
by G.S. Puri | .
by C.R.W. Spedding | .
by A. H . Fitter | .
by B.J. Miflin | .
by Robert Fried | .
by S. K. Kapur | .
by George Simpson | Fritz Kelfa.
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