-
Darwin Unbuttoned
April 28, 1988
Charles Darwin’s Notebooks, 18361844: Geology, Transmutation of Species, Metaphysical Enquiries transcribed and edited by Paul H. Barrett, by Peter J. Gautrey, by Sandra Herbert, by David Kohn, by Sydney Smith
The Correspondence of Charles Darwin Volume 3: 18441846 edited by Frederick Burkhardt, edited by Sydney Smith