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by Edited by Frederick Burkhardt
by Edited by Frederick Burkhardt , Alison M. Pearn , Samantha Evans
by Burkhardt, Frederick; Secord, James A.; Evans, Samantha; et al.
by Darwin, Charles; Burkhardt, Frederick; Secord, James A.; et al.
by Darwin, Charles; Burkhardt, Frederick; Secord, James A.
by Charles Darwin , Edited by Frederick Burkhardt , Duncan M. Porter , Sheila Ann Dean , Samantha Evans , Shelley Innes , Alison M. Pearn
by Charles Darwin , Edited by Frederick Burkhardt , James Secord , The Editors of the Darwin Correspondence Project
by Burkhardt, Frederick