Carruthers, R. G., 1910, On the evolution of Zaphrentis delanouei in Lower Carboniferous times: Geological Society of London Quarterly Journal, v. 66, p. 523-538.

Ingulls, A. G., 1940, The Carboniferous mystery: Scientific American, v. 162, p. 14.

[Return to A Keyword-Indexed Origins Bibliography]

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