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More letters of Charles Darwin. A record of his work in a series of hitherto unpublished letters. Vol. I + II.

Darwin and Modern Science : Essays in commemoration of the centenary of the birth if Charles Darwin and of the fithtieth anniversary of the publication of "The Origin of Species"

Cambridge Botanical Handbooks. Algae. Vol. I. Myxophyceae, Peridinieae, Bacillarieae, Chlorophyceae, together with a brief summery of the occurence and distribution of freshwater algae.