This bibliography has been extensively supplemented by the Freeman Bibliographical Database at Darwin Online edited by John van Wyhe. "The database has been supplemented by the entries from unpublished manuscript corrections by Freeman and those in:
Freeman. 1986. The works of Charles Darwin: an annotated bibliographical handlist. Additions and Corrections to Second Edition of 1977 to 1 January, 1986. University College London: for the author; as well as Freeman. 1986. Darwin in Chinese. Archives of Natural History 13 (1): 19-24; P. J. P. Whitehead. 1988. Darwin in Chinese: some additions. Archives of Natural History 15 (1): 61-62; the bibliography of The Correspondence of Charles Darwin; and subsequent research by John van Wyhe, Kees Rookmaaker, Angus Carroll, J. David Archibald and other contributors."